Ray Optics Online Test 12th Science Questions
Ray Optics Online Test 12th Science Questions
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- Answered
- Review
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Question 1 of 122
1. Question
Which of the following statement is correct?
1) Light is difficult to comprehend light to a single entity
2) It has both ray and wave property
3) Ray optics deals with light that is represented as a ray travelling in straight linesCorrect
Light is mystical. Yet, its behaviour is so fascinating. It is difficult to comprehend light to a single entity. In this unit, we learn it in two different scientific aspects called ray optics and wave optics. Ray optics deals with light that is represented as a ray travelling in straight lines. In wave optics, we study about the phenomenon associated with the propagation of light as a wave.
Incorrect
Light is mystical. Yet, its behaviour is so fascinating. It is difficult to comprehend light to a single entity. In this unit, we learn it in two different scientific aspects called ray optics and wave optics. Ray optics deals with light that is represented as a ray travelling in straight lines. In wave optics, we study about the phenomenon associated with the propagation of light as a wave.
-
Question 2 of 122
2. Question
Which of the following statement is incorrect?
1) Light travels in a straight line in a medium
2) Light does not deviate from its path when it encounters another medium or an obstacleCorrect
Light travels in a straight line in a medium. Light may deviate in its path only when it encounters another medium or an obstacle.
Incorrect
Light travels in a straight line in a medium. Light may deviate in its path only when it encounters another medium or an obstacle.
-
Question 3 of 122
3. Question
Which of the following statement is correct?
1) A ray of light gives information about only the direction of light.
2) It gives information about the other characteristics of light like intensity and colourCorrect
A ray of light gives information about only the direction of light. It does not give information about the other characteristics of light like intensity and colour.
Incorrect
A ray of light gives information about only the direction of light. It does not give information about the other characteristics of light like intensity and colour.
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Question 4 of 122
4. Question
Which of the following can be understood from ray depiction of light?
1) Reflection
2) Refraction
3) DispersionCorrect
The path of the light is called a ray of light and a bundle of such rays is called a beam of light. In this chapter, we can explain the phenomena of reflection, refraction, dispersion and scattering of light, using the ray depiction of light.
Incorrect
The path of the light is called a ray of light and a bundle of such rays is called a beam of light. In this chapter, we can explain the phenomena of reflection, refraction, dispersion and scattering of light, using the ray depiction of light.
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Question 5 of 122
5. Question
The bouncing back of light into the same medium is called______
Correct
The bouncing back of light into the same medium when it encounters a reflecting surface is called reflection of light.
Incorrect
The bouncing back of light into the same medium when it encounters a reflecting surface is called reflection of light.
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Question 6 of 122
6. Question
Mirrors which are silver coated at their back can reflect almost ___% of the light falling on them.
Correct
Polished surfaces can reflect light. Mirrors which are silver coated at their back can reflect almost 90% of the light falling on them.
Incorrect
Polished surfaces can reflect light. Mirrors which are silver coated at their back can reflect almost 90% of the light falling on them.
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Question 7 of 122
7. Question
Which of the following is correct according to law of reflection?
1) The incident ray, reflected ray and normal to the reflecting surface all are coplanar
2) The angle of incidence i is equal to the angle of reflection r
3) The angle of incidence i is not equal to the angle of reflection r.Correct
According to law of reflection,
(a) The incident ray, reflected ray and normal to the reflecting surface all are coplanar (ie. lie in the same plane).
(b) The angle of incidence i is equal to the angle of reflection r
i = rIncorrect
According to law of reflection,
(a) The incident ray, reflected ray and normal to the reflecting surface all are coplanar (ie. lie in the same plane).
(b) The angle of incidence i is equal to the angle of reflection r
i = r -
Question 8 of 122
8. Question
Which of the following statement is incorrect?
1) The law of reflection is valid at each point for any reflecting surface whether the surface is plane or curved
2) The angle between the incident and deviated light ray is called angle of deviation of the light ray.Correct
The law of reflection is valid at each point for any reflecting surface whether the surface is plane or curved. The angle between the incident and deviated light ray is called angle of deviation of the light ray.
Incorrect
The law of reflection is valid at each point for any reflecting surface whether the surface is plane or curved. The angle between the incident and deviated light ray is called angle of deviation of the light ray.
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Question 9 of 122
9. Question
Which of the following statement is correct?
1) If the reflecting surface is flat, then incident parallel rays after reflection come out parallel as per the law of reflection.
2) If the reflecting surface is irregular, then the incident parallel rays after reflection come out irregular raysCorrect
If the reflecting surface is flat, then incident parallel rays after reflection come out parallel as per the law of reflection. If the reflecting surface is irregular, then the incident parallel rays after reflection come out irregular (not parallel) rays.
Incorrect
If the reflecting surface is flat, then incident parallel rays after reflection come out parallel as per the law of reflection. If the reflecting surface is irregular, then the incident parallel rays after reflection come out irregular (not parallel) rays.
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Question 10 of 122
10. Question
Which of the following can be use to find angle of deviation?
Correct
The angle between the incident and deviated light ray is called angle of deviation of the light ray. The incident light is AO. The reflected light is OB. The un-deviated light is OC which is the continuation of the incident light. The angle between OB and OC is the angle of deviation d. From the geometry, it is written as, d = 180 – (i+r). As, i = r in reflection, we can write angle of deviation in reflection at plane surface as,
d = 180 – 2iIncorrect
The angle between the incident and deviated light ray is called angle of deviation of the light ray. The incident light is AO. The reflected light is OB. The un-deviated light is OC which is the continuation of the incident light. The angle between OB and OC is the angle of deviation d. From the geometry, it is written as, d = 180 – (i+r). As, i = r in reflection, we can write angle of deviation in reflection at plane surface as,
d = 180 – 2i -
Question 11 of 122
11. Question
When a real object is placed at a point O in front of a plane mirror it produces divergent rays in__
Correct
When a real object is placed at a point O in front of a plane mirror it produces divergent rays in all directions as shown in Figure
Incorrect
When a real object is placed at a point O in front of a plane mirror it produces divergent rays in all directions as shown in Figure
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Question 12 of 122
12. Question
Image which cannot be formed on the screen but can only be seen with the eyes is called____
Correct
After reflection from the plane mirror, they appear to come out from a point I behind the mirror. This image cannot be formed on a screen as the image is behind the mirror. This type of image which cannot be formed on the screen but can only be seen with the eyes is called virtual image
Incorrect
After reflection from the plane mirror, they appear to come out from a point I behind the mirror. This image cannot be formed on a screen as the image is behind the mirror. This type of image which cannot be formed on the screen but can only be seen with the eyes is called virtual image
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Question 13 of 122
13. Question
Image which can be formed on a screen and can also be seen with the eyes is called______
Correct
On the other hand, if convergent rays are incident on a plane mirror, the rays after reflection pass through a point I in front of the mirror and form an image as shown in Figure. This image can be formed on a screen as the image is in front of the mirror. This type of image which can be formed on a screen and can also be seen with the eyes is called real image.
Incorrect
On the other hand, if convergent rays are incident on a plane mirror, the rays after reflection pass through a point I in front of the mirror and form an image as shown in Figure. This image can be formed on a screen as the image is in front of the mirror. This type of image which can be formed on a screen and can also be seen with the eyes is called real image.
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Question 14 of 122
14. Question
It is generally known that a plane mirror can only form a______
Correct
It is generally known that a plane mirror can only form a virtual image. But now we have understood that a plane mirror can form a real image when converging rays fall on it.
Incorrect
It is generally known that a plane mirror can only form a virtual image. But now we have understood that a plane mirror can form a real image when converging rays fall on it.
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Question 15 of 122
15. Question
Match the following
I. Real Image 1. Rays appear to converge at the object
II. Virtual Image 2. Rays actually diverge from the object
III. Real Object 3. Rays appear to diverge from the image
IV. Virtual Object 4. Rays actually converge at the imageCorrect
Incorrect
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Question 16 of 122
16. Question
Which of the following statement is correct?
- A spherical surface is a part cut from a hollow sphere.
- Spherical mirrors are generally constructed from glass
- Both the surface of the glass is silvered.
Correct
A spherical surface is a part cut from a hollow sphere. Spherical mirrors are generally constructed from glass. One surface of the glass is silvered. The reflection takes place at the other polished surface.
Incorrect
A spherical surface is a part cut from a hollow sphere. Spherical mirrors are generally constructed from glass. One surface of the glass is silvered. The reflection takes place at the other polished surface.
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Question 17 of 122
17. Question
Which of the following statement is correct?
- If the reflection takes place at the convex surface, it is called a convex mirror
- If the reflection takes place at the concave surface, it is called a concave lens
Correct
If the reflection takes place at the convex surface, it is called a convex mirror and if the reflection takes place at the concave surface, it is called a concave mirror.
Incorrect
If the reflection takes place at the convex surface, it is called a convex mirror and if the reflection takes place at the concave surface, it is called a concave mirror.
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Question 18 of 122
18. Question
The middle point on the spherical surface of the mirror is called as____
Correct
The radius of the sphere of which the spherical mirror is a part is called the radius of curvature (R) of the mirror. The middle point on the spherical surface of the mirror (or) the geometrical centre of the mirror is called pole (P) of the mirror.
Incorrect
The radius of the sphere of which the spherical mirror is a part is called the radius of curvature (R) of the mirror. The middle point on the spherical surface of the mirror (or) the geometrical centre of the mirror is called pole (P) of the mirror.
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Question 19 of 122
19. Question
The line joining the pole and the centre of curvature is called_____
Correct
The line joining the pole and the centre of curvature is called the principal axis of the mirror. The light ray travelling along the principal axis towards the mirror after reflection travels back along the same principal axis. It is also called optical axis.
Incorrect
The line joining the pole and the centre of curvature is called the principal axis of the mirror. The light ray travelling along the principal axis towards the mirror after reflection travels back along the same principal axis. It is also called optical axis.
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Question 20 of 122
20. Question
Which of the following statement is correct?
- Light rays travelling parallel and close to the principal axis when incident on a spherical mirror, converge at a point for concave mirror or appear to diverge from a point for convex mirror on the principal axis
- This point is called the focus or focal point (F) of the mirror
Correct
Light rays travelling parallel and close to the principal axis when incident on a spherical mirror, converge at a point for concave mirror or appear to diverge from a point for convex mirror on the principal axis. This point is called the focus or focal point (F) of the mirror.
Incorrect
Light rays travelling parallel and close to the principal axis when incident on a spherical mirror, converge at a point for concave mirror or appear to diverge from a point for convex mirror on the principal axis. This point is called the focus or focal point (F) of the mirror.
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Question 21 of 122
21. Question
The distance between the pole and the focus is called______
Correct
The distance between the pole and the focus is called the focal length (f) of the mirror. The plane through the focus and perpendicular to the principal axis is called the focal plane of the mirror.
Incorrect
The distance between the pole and the focus is called the focal length (f) of the mirror. The plane through the focus and perpendicular to the principal axis is called the focal plane of the mirror.
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Question 22 of 122
22. Question
Which of the following statement is correct?
- The rays travelling very close to the principal axis and make small angles with it are called paraxial rays
- The paraxial rays fall on the mirror very close to the pole of the mirror
Correct
The rays travelling very close to the principal axis and make small angles with it are called paraxial rays. The paraxial rays fall on the mirror very close to the pole of the mirror.
Incorrect
The rays travelling very close to the principal axis and make small angles with it are called paraxial rays. The paraxial rays fall on the mirror very close to the pole of the mirror.
-
Question 23 of 122
23. Question
Which of the following statement is incorrect?
- The rays travelling far away from the principal axis and fall on the mirror far away from the pole are called as marginal rays
- Paraxial rays and marginal rays behave differently
Correct
On the other hand, the rays travelling far away from the principal axis and fall on the mirror far away from the pole are called as marginal rays. Both Paraxial rays and marginal rays behave differently (get focused at different points).
Incorrect
On the other hand, the rays travelling far away from the principal axis and fall on the mirror far away from the pole are called as marginal rays. Both Paraxial rays and marginal rays behave differently (get focused at different points).
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Question 24 of 122
24. Question
Radius of curvature is equal to____
Correct
PF is focal length f and PC is the radius of curvature R.
Incorrect
PF is focal length f and PC is the radius of curvature R.
-
Question 25 of 122
25. Question
Which of the following statement is correct?
1) A ray parallel to the principal axis after reflection will pass through or appear to pass through the principal focus.
2) A ray passing through or appear to pass through the principal focus, after reflection will travel parallel to the principal axis.Correct
A ray parallel to the principal axis after reflection will pass through or appear to pass through the principal focus. A ray passing through or appear to pass through the principal focus, after reflection will travel parallel to the principal axis.
Incorrect
A ray parallel to the principal axis after reflection will pass through or appear to pass through the principal focus. A ray passing through or appear to pass through the principal focus, after reflection will travel parallel to the principal axis.
-
Question 26 of 122
26. Question
Which of the following statement is incorrect?
1) A ray passing through the centre of curvature retraces its path after reflection as it is a case of normal incidence
2) A ray falling on the pole will get refracted as per law of reflection keeping principal axis as the normalCorrect
A ray passing through the centre of curvature retraces its path after reflection as it is a case of normal incidence. A ray falling on the pole will get reflected as per law of reflection keeping principal axis as the normal.
Incorrect
A ray passing through the centre of curvature retraces its path after reflection as it is a case of normal incidence. A ray falling on the pole will get reflected as per law of reflection keeping principal axis as the normal.
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Question 27 of 122
27. Question
Match the following cartesian signs
I. u 1. Image height
II. v 2. Object height
III. h 3. Image distance
IV. h’ 4. Object distanceCorrect
While tracing the image, we would normally come across the object distance u, the image distance v, the object height h, the image height (h′), the focal length f and the radius of curvature R.
Incorrect
While tracing the image, we would normally come across the object distance u, the image distance v, the object height h, the image height (h′), the focal length f and the radius of curvature R.
-
Question 28 of 122
28. Question
Which of the following cartesian sign convection is correct?
1) The Incident light is taken from left to right (i.e. object on the left of mirror)
2) All the distances are measured from the pole of the mirror (pole is taken as origin).Correct
Cartesian sign convention:
• The Incident light is taken from left to right (i.e. object on the left of mirror).
• All the distances are measured from the pole of the mirror (pole is taken as origin).Incorrect
Cartesian sign convention:
• The Incident light is taken from left to right (i.e. object on the left of mirror).
• All the distances are measured from the pole of the mirror (pole is taken as origin). -
Question 29 of 122
29. Question
Which of the following statement about cartesian sign is correct?
1) The distances measured to the right of pole along the principal axis are taken as positive
2) The distances measured to the left of pole along the principal axis are taken as negative.
3) Heights measured in the upward perpendicular direction to the principal axis are taken as negativeCorrect
Cartesian sign convention:
• The distances measured to the right of pole along the principal axis are taken as positive.
• The distances measured to the left of pole along the principal axis are taken as negative.
• Heights measured in the upward perpendicular direction to the principal axis are taken as positive.
• Heights measured in the downward perpendicular direction to the principal axis, are taken as negative.Incorrect
Cartesian sign convention:
• The distances measured to the right of pole along the principal axis are taken as positive.
• The distances measured to the left of pole along the principal axis are taken as negative.
• Heights measured in the upward perpendicular direction to the principal axis are taken as positive.
• Heights measured in the downward perpendicular direction to the principal axis, are taken as negative. -
Question 30 of 122
30. Question
Which of the following is mirror equation?
Correct
The following equation is mirror equation:
Incorrect
The following equation is mirror equation:
-
Question 31 of 122
31. Question
The lateral or transverse magnification is defined as the ratio of______
Correct
The lateral or transverse magnification is defined as the ratio of the height of the image to the height of the object. Height of the object and image are measured perpendicular to the principal axis
Incorrect
The lateral or transverse magnification is defined as the ratio of the height of the image to the height of the object. Height of the object and image are measured perpendicular to the principal axis
-
Question 32 of 122
32. Question
An object is placed at a distance of 20.0 cm from a concave mirror of focal length 15.0 cm. What
distance from the mirror a screen should be placed to get a sharp image?
Correct
Incorrect
-
Question 33 of 122
33. Question
An object is placed at a distance of 20.0 cm from a concave mirror of focal length 15.0 cm. What
is its magnification?
Correct
Incorrect
-
Question 34 of 122
34. Question
A thin rod of length f/3 is placed along the optical axis of a concave mirror of focal length f such
that its image which is real and elongated just touches the rod. Calculate the longitudinal
magnification
Correct
Incorrect
-
Question 35 of 122
35. Question
Which of the following statement is correct?
1) Light travels with the highest speed in vacuum.
2) The speed of light in vacuum is denoted as c and its value is, c = 3×108 ms-1
3) The earliest attempt to find speed of light was made by a French scientist Hippolyte FizeauCorrect
Light travels with the highest speed in vacuum. The speed of light in vacuum is denoted as c and its value is, c = 3×108 ms-1. It is a very high value. Several attempts were made by scientists to determine the speed of light. The earliest attempt was made by a French scientist Hippolyte Fizeau (1819– 1896). That paved way for the other scientists too to determine the speed of light.
Incorrect
Light travels with the highest speed in vacuum. The speed of light in vacuum is denoted as c and its value is, c = 3×108 ms-1. It is a very high value. Several attempts were made by scientists to determine the speed of light. The earliest attempt was made by a French scientist Hippolyte Fizeau (1819– 1896). That paved way for the other scientists too to determine the speed of light.
-
Question 36 of 122
36. Question
At what angle incident light was made to hit silvered glass in Fizeau’s method to determine speed
of light?
- 300
- 450
- 600
- 900
Correct
In Fizeau’s method to determine speed of light, e light from the source S was first allowed to fall on a partially silvered glass plate G kept at an angle of 45o to the incident light from the source.
Incorrect
In Fizeau’s method to determine speed of light, e light from the source S was first allowed to fall on a partially silvered glass plate G kept at an angle of 45o to the incident light from the source.
-
Question 37 of 122
37. Question
Which of the following statement is correct?
1) Fizeau had some difficulty to visually estimate the minimum intensity of the light when blocked by the adjacent tooth, and his value for speed of light was very close to the actual value
2) Later on, with the same idea of Fizeau and with much sophisticated instruments, the speed of light in air was determined as, v = 2.99792×108 m s–1Correct
Fizeau had some difficulty to visually estimate the minimum intensity of the light when blocked by the adjacent tooth, and his value for speed of light was very close to the actual value. Later on, with the same idea of Fizeau and with much sophisticated instruments, the speed of light in air was determined as, v = 2.99792×108 m s–1.
Incorrect
Fizeau had some difficulty to visually estimate the minimum intensity of the light when blocked by the adjacent tooth, and his value for speed of light was very close to the actual value. Later on, with the same idea of Fizeau and with much sophisticated instruments, the speed of light in air was determined as, v = 2.99792×108 m s–1.
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Question 38 of 122
38. Question
Who introduced Different transparent media like glass, water to find speed of light?
Correct
Different transparent media like glass, water etc. were introduced in the path of light by scientists like Foucault (1819– 1868) and Michelson (1852–1931) to find the speed of light in different media.
Incorrect
Different transparent media like glass, water etc. were introduced in the path of light by scientists like Foucault (1819– 1868) and Michelson (1852–1931) to find the speed of light in different media.
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Question 39 of 122
39. Question
Refractive index of a transparent medium is__
Correct
Refractive index of a transparent medium is defined as the ratio of speed of light in vacuum (or air) to the speed of light in that medium.
Incorrect
Refractive index of a transparent medium is defined as the ratio of speed of light in vacuum (or air) to the speed of light in that medium.
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Question 40 of 122
40. Question
One type of transparent glass has refractive index 1.5. What is the speed of light through this
glass?
- 2×108 ms-1
- 2×108 ms-2
- 3×108 ms-1
- 2×108 ms3
Correct
Incorrect
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Question 41 of 122
41. Question
The smallest value of refractive index is for vacuum and is_____
Correct
Refractive index does not have unit. The smallest value of refractive index is for vacuum, which is 1. For any other medium refractive index is greater than 1.
Incorrect
Refractive index does not have unit. The smallest value of refractive index is for vacuum, which is 1. For any other medium refractive index is greater than 1.
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Question 42 of 122
42. Question
______ is also called as optical density of the medium.
Correct
Refractive index is also called as optical density of the medium. Higher the refractive index of a medium, greater is its optical density and speed of light through the medium is lesser and vice versa.
Incorrect
Refractive index is also called as optical density of the medium. Higher the refractive index of a medium, greater is its optical density and speed of light through the medium is lesser and vice versa.
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Question 43 of 122
43. Question
Match the media with the respective refractive index:
I. Air 1. 1.46
II. Pure water 2. 1.0003
III. Ice 3. 1.31
IV. Quartz 4. 1.33Correct
Incorrect
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Question 44 of 122
44. Question
Match the media with the respective refractive index:
I. Gallium phosphide 1. 3.50
II. Diamond 2. 2.16
III. Qubic zirconia 3. 2.42
IV. Sapphire 4. 1.77Correct
Incorrect
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Question 45 of 122
45. Question
Light travels from air in to glass slab of thickness 50 cm and refractive index 1.5. What is the
speed of light in glass?
- 2 x 108 m s-1
- 3 x 108 m s-1
- 5 x 108 m s-1
- 12 x 108 m s-1
Correct
Incorrect
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Question 46 of 122
46. Question
Light travels from air in to glass slab of thickness 50 cm and refractive index 1.5. What is the time
taken by the light to travel through the glass slab?
- 5 x 10-9 s
- 5 x 10-9 s
- 5 x 10-9 s
- 5 x 10-9 s
Correct
Incorrect
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Question 47 of 122
47. Question
Light travels from air in to glass slab of thickness 50 cm and refractive index 1.5. What is the
optical path of the glass slab?
Correct
Incorrect
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Question 48 of 122
48. Question
Which of the following statement is correct?
1) Refraction is passing through of light from one optical medium to another optical medium through a boundary
2) Law of refraction is called Snell’s lawCorrect
Refraction is passing through of light from one optical medium to another optical medium through a boundary. In refraction, the angle of incidence i in one medium and the angle of reflection r in the other medium are measured with respect to the normal drawn to the surface at the point of incidence of light. Law of refraction is called Snell’s law
Incorrect
Refraction is passing through of light from one optical medium to another optical medium through a boundary. In refraction, the angle of incidence i in one medium and the angle of reflection r in the other medium are measured with respect to the normal drawn to the surface at the point of incidence of light. Law of refraction is called Snell’s law
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Question 49 of 122
49. Question
For normal incidence of light on a surface, the angle of incidence is______
- 450
- 00
- 300
- 600
Correct
Incorrect
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Question 50 of 122
50. Question
Which of the following is correct regarding Snell’s law?
Correct
The ratio of angle of incident i in the first medium to the angle of reflection r in the second medium is equal to the ratio of refractive index of the second medium n2 to that of the refractive index of the first medium n1.
Incorrect
The ratio of angle of incident i in the first medium to the angle of reflection r in the second medium is equal to the ratio of refractive index of the second medium n2 to that of the refractive index of the first medium n1.
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Question 51 of 122
51. Question
The angle of deviation is equal to__, When light travels from rarer to denser medium
Correct
We know that the angle between the incident and deviated light is called angle of deviation. When light travels from rarer to denser medium it deviates towards normal as shown in Figure 6.16. The angle of deviation in this case is,
Incorrect
We know that the angle between the incident and deviated light is called angle of deviation. When light travels from rarer to denser medium it deviates towards normal as shown in Figure 6.16. The angle of deviation in this case is,
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Question 52 of 122
52. Question
Which of the following statement about Characteristics of refraction is correct?
1) When light passes from rarer medium to denser medium it deviates towards normal in the denser medium.
2) When light passes from denser medium to rarer medium it deviates away from normal in the rarer mediumCorrect
Characteristics of refraction:
• When light passes from rarer medium to denser medium it deviates towards normal in the denser medium.
• When light passes from denser medium to rarer medium it deviates away from normal in the rarer medium.Incorrect
Characteristics of refraction:
• When light passes from rarer medium to denser medium it deviates towards normal in the denser medium.
• When light passes from denser medium to rarer medium it deviates away from normal in the rarer medium. -
Question 53 of 122
53. Question
The phenomenon in which a part of light from a source undergoing reflection and the other part of
light from the same source undergoing refraction at the same surface is called____Correct
The phenomenon in which a part of light from a source undergoing reflection and the other part of light from the same source undergoing refraction at the same surface is called simultaneous reflection or simultaneous refraction. Such surfaces are available as partially silvered glasses.\
Incorrect
The phenomenon in which a part of light from a source undergoing reflection and the other part of light from the same source undergoing refraction at the same surface is called simultaneous reflection or simultaneous refraction. Such surfaces are available as partially silvered glasses.\
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Question 54 of 122
54. Question
Assertion(A): Production of optical surfaces capable of refracting as well as reflecting is possible
Reason(R): Glass can be made partially see through and partially reflecting by varying the
amount of coating on its surfaceCorrect
Production of optical surfaces capable of refracting as well as reflecting is possible by properly coating the surfaces with suitable materials. Thus, a glass can be made partially see through and partially reflecting by varying the amount of coating on its surface.
Incorrect
Production of optical surfaces capable of refracting as well as reflecting is possible by properly coating the surfaces with suitable materials. Thus, a glass can be made partially see through and partially reflecting by varying the amount of coating on its surface.
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Question 55 of 122
55. Question
Which of the following are the name of partially reflecting mirror?
1) Two-way mirror
2) Half-silvered mirror
3) Semi-silvered mirrorCorrect
Partially reflecting mirror is commercially called as two-way mirror, half-silvered or semi-silvered mirror etc.
Incorrect
Partially reflecting mirror is commercially called as two-way mirror, half-silvered or semi-silvered mirror etc.
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Question 56 of 122
56. Question
Which of the following statement is correct?
1) In semi-silvered mirror, hidden cameras can be kept behind
2) We need to be cautious when we stand in front of mirrors kept in unknown places.Correct
Partially reflecting mirror is commercially called as two-way mirror, half- silvered or semi-silvered mirror etc. This gives a perception of regular mirror if the other side is made dark. But still hidden cameras can be kept behind such mirrors. We need to be cautious when we stand in front of mirrors kept in unknown places.
Incorrect
Partially reflecting mirror is commercially called as two-way mirror, half- silvered or semi-silvered mirror etc. This gives a perception of regular mirror if the other side is made dark. But still hidden cameras can be kept behind such mirrors. We need to be cautious when we stand in front of mirrors kept in unknown places.
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Question 57 of 122
57. Question
Which of the following statement about partially reflecting mirror is correct?
1) There is a method to test the two-way mirror
2) Place the finger nail against the mirror surface, if there is a gap between nail and its image, then it is a regular mirror.
3) If the fingernail directly touches its image, then it is a two-way mirror.Correct
We need to be cautious when we stand in front of mirrors kept in unknown places. There is a method to test the two-way mirror. Place the finger nail against the mirror surface. If there is a gap between nail and its image, then it is a regular mirror. If the fingernail directly touches its image, then it is a two-way mirror.
Incorrect
We need to be cautious when we stand in front of mirrors kept in unknown places. There is a method to test the two-way mirror. Place the finger nail against the mirror surface. If there is a gap between nail and its image, then it is a regular mirror. If the fingernail directly touches its image, then it is a two-way mirror.
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Question 58 of 122
58. Question
Light travelling through transparent oil enters in to glass of refractive index 1.5. If the refractive
index of glass with respect to the oil is 1.25, what is the refractive index of the oil?Correct
Incorrect
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Question 59 of 122
59. Question
A coin is at the bottom of a trough containing three immiscible liquids of refractive indices 1.3,
1.4 and 1.5 poured one above the other of heights 30 cm, 16 cm, and 20 cm respectively. What is
the apparent depth at which the coin appears to be when seen from air medium outside?Correct
Incorrect
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Question 60 of 122
60. Question
When a ray passes from an optically denser medium to an optically rarer medium, it bends__ from
NormalCorrect
When a ray passes from an optically denser medium to an optically rarer medium, it bends away from normal. Because of this, the angle of refraction r on the rarer medium is greater than the corresponding angle of incidence i in the denser medium. As angle of incidence i is gradually increased, r rapidly increases and at a certain stage it becomes 90° or gracing the boundary.
Incorrect
When a ray passes from an optically denser medium to an optically rarer medium, it bends away from normal. Because of this, the angle of refraction r on the rarer medium is greater than the corresponding angle of incidence i in the denser medium. As angle of incidence i is gradually increased, r rapidly increases and at a certain stage it becomes 90° or gracing the boundary.
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Question 61 of 122
61. Question
Which of the following statement is correct?
- Due to refraction of light through different layers of atmosphere which vary in refractive index, the path of light deviates continuously when it passes through atmosphere
- Sun is visible a little before the actual sunrise and also until a little after the actual sunset due to refraction of light through the atmosphere
Correct
Due to refraction of light through different layers of atmosphere which vary in refractive index, the path of light deviates continuously when it passes through atmosphere. For example, the Sun is visible a little before the actual sunrise and also until a little after the actual sunset due to refraction of light through the atmosphere. By actual sunrise what we mean is the actual crossing of the sun at the horizon
Incorrect
Due to refraction of light through different layers of atmosphere which vary in refractive index, the path of light deviates continuously when it passes through atmosphere. For example, the Sun is visible a little before the actual sunrise and also until a little after the actual sunset due to refraction of light through the atmosphere. By actual sunrise what we mean is the actual crossing of the sun at the horizon
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Question 62 of 122
62. Question
The apparent shift in the direction of the sun is around half a degree and the corresponding time
difference between actual and apparent positions is about___
Correct
The apparent shift in the direction of the sun is around half a degree and the corresponding time difference between actual and apparent positions is about 2 minutes. Sun appears flattened (oval shaped) during sun rise and sunset due to the same phenomenon.
Incorrect
The apparent shift in the direction of the sun is around half a degree and the corresponding time difference between actual and apparent positions is about 2 minutes. Sun appears flattened (oval shaped) during sun rise and sunset due to the same phenomenon.
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Question 63 of 122
63. Question
Which of the following statement is correct?
- If the angle of incidence in the denser medium is increased beyond the critical angle, there is no refraction possible in to the rarer medium
- The entire light is reflected back into the denser medium itself. This phenomenon is called total internal reflection
Correct
If the angle of incidence in the denser medium is increased beyond the critical angle, there is no refraction possible in to the rarer medium. The entire light is reflected back into the denser medium itself. This phenomenon is called total internal reflection.
Incorrect
If the angle of incidence in the denser medium is increased beyond the critical angle, there is no refraction possible in to the rarer medium. The entire light is reflected back into the denser medium itself. This phenomenon is called total internal reflection.
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Question 64 of 122
64. Question
Which of the following are the conditions for total internal reflection?
- Light must travel from denser to rarer medium
- Angle of incidence in the denser medium must be greater than critical angle
Correct
The two conditions for total internal reflection are,
(a) light must travel from denser to rarer medium,
(b) angle of incidence in the denser medium must be greater than critical angle (i>ic).
Incorrect
The two conditions for total internal reflection are,
(a) light must travel from denser to rarer medium,
(b) angle of incidence in the denser medium must be greater than critical angle (i>ic).
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Question 65 of 122
65. Question
The critical angle for water-air interface is____o
Correct
Refractive index of glass is about 1.5. The critical angle for glass-air interface is
The critical angle for water-air interface is,
Incorrect
Refractive index of glass is about 1.5. The critical angle for glass-air interface is
The critical angle for water-air interface is,
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Question 66 of 122
66. Question
Match the refractive index with the respective material:
I. Ice 1. 1.541
II. Water 2. 1.333
III. Crown glass 3. 1.310
IV. Diamond 4. 2.417Correct
Incorrect
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Question 67 of 122
67. Question
Which of the followign statement is correct?
- Diamond appears dazzling because the total internal reflection of light happens inside the diamond
- The refractive index of only diamond is about 1.417.
Correct
Diamond appears dazzling because the total internal reflection of light happens inside the diamond. The refractive index of only diamond is about 2.417.
Incorrect
Diamond appears dazzling because the total internal reflection of light happens inside the diamond. The refractive index of only diamond is about 2.417.
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Question 68 of 122
68. Question
The critical angle of diamond is about____ o
Correct
Diamond is much larger than that for ordinary glass which is about only 1.5. The critical angle of diamond is about 24.4°. It is much less than that of glass. A skilled diamond cutter makes use of this larger range of angle of incidence (24.4° to 90° inside the diamond), to ensure that light entering the diamond is total internally reflected from the many cut faces before getting out.
Incorrect
Diamond is much larger than that for ordinary glass which is about only 1.5. The critical angle of diamond is about 24.4°. It is much less than that of glass. A skilled diamond cutter makes use of this larger range of angle of incidence (24.4° to 90° inside the diamond), to ensure that light entering the diamond is total internally reflected from the many cut faces before getting out.
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Question 69 of 122
69. Question
Which of the following statement is correct?
- The refractive index of air increases with its density
- Hot air is more dense
Correct
The refractive index of air increases with its density. In hot places, air near the ground is hotter than air at a height. Hot air is less dense.
Incorrect
The refractive index of air increases with its density. In hot places, air near the ground is hotter than air at a height. Hot air is less dense.
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Question 70 of 122
70. Question
Assertion(A): In the cold places the refractive index increases towards the ground
Reason(R): The temperature of air close to the ground is lesser than the temperature above the
surface of earth
Correct
In the cold places the refractive index increases towards the ground because the temperature of air close to the ground is lesser than the temperature above the surface of earth. Thus, the density and refractive index of air near the ground is greater than at a height.
Incorrect
In the cold places the refractive index increases towards the ground because the temperature of air close to the ground is lesser than the temperature above the surface of earth. Thus, the density and refractive index of air near the ground is greater than at a height.
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Question 71 of 122
71. Question
Where does reverse effect of mirage will take place?
1) Desert
2) Glacier
3) Sea
4) Frozen lakeCorrect
In the cold regions like glaciers and frozen lakes and seas, the reverse effect of mirage will happen. Hence, an inverted image is formed little above the surface.
Incorrect
In the cold regions like glaciers and frozen lakes and seas, the reverse effect of mirage will happen. Hence, an inverted image is formed little above the surface.
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Question 72 of 122
72. Question
Which of the following statement is correct?
1) When a light source like electric bulb is kept inside a water tank, the light from the source travels in all direction inside the water
2) The light that is incident on the water surface at an angle less than the critical angle will undergo refraction and emerge out from the water.Correct
When a light source like electric bulb is kept inside a water tank, the light from the source travels in all direction inside the water. The light that is incident on the water surface at an angle less than the critical angle will undergo refraction and emerge out from the water. The light incident at an angle greater than critical angle will undergo total internal reflection.The light falling particularly at critical angle graces the surface.
Incorrect
When a light source like electric bulb is kept inside a water tank, the light from the source travels in all direction inside the water. The light that is incident on the water surface at an angle less than the critical angle will undergo refraction and emerge out from the water. The light incident at an angle greater than critical angle will undergo total internal reflection.The light falling particularly at critical angle graces the surface.
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Question 73 of 122
73. Question
What is the radius of the illumination when seen above from inside a swimming pool from a depth
of 10 m on a sunny day? What is the total angle of view? [Given, refractive index of water is 4/3]a) 48.6o
b) 97.2o
c) 112.9o
d) 99.2oCorrect
Incorrect
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Question 74 of 122
74. Question
Which of the following statement is correct?
1) Transmitting signals through optical fibres is possible due to the phenomenon of total internal reflection.
2) Optical fibres consists of inner part called core and outer part called cladding (or) sleeving.Correct
Transmitting signals through optical fibres is possible due to the phenomenon of total internal reflection. Optical fibres consists of inner part called core and outer part called cladding (or) sleeving
Incorrect
Transmitting signals through optical fibres is possible due to the phenomenon of total internal reflection. Optical fibres consists of inner part called core and outer part called cladding (or) sleeving
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Question 75 of 122
75. Question
The refractive index of the material of the core must be___ than that of the cladding for total
internal reflection to happen
Correct
The refractive index of the material of the core must be higher than that of the cladding for total internal reflection to happen. Signal in the form of light is made to incident inside the core-cladding boundary at an angle greater than the critical angle. Hence, it undergoes repeated total internal reflections along the length of the fibre without undergoing any refraction.
Incorrect
The refractive index of the material of the core must be higher than that of the cladding for total internal reflection to happen. Signal in the form of light is made to incident inside the core-cladding boundary at an angle greater than the critical angle. Hence, it undergoes repeated total internal reflections along the length of the fibre without undergoing any refraction.
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Question 76 of 122
76. Question
Which of the following statement is incorrect?
1) To ensure the critical angle incidence in the core-cladding boundary inside the optical fibre, the light should be incident at a certain angle at the end of the optical fiber while entering in to it
2) This angle is called acceptance angle.Correct
To ensure the critical angle incidence in the core-cladding boundary inside the optical fibre, the light should be incident at a certain angle at the end of the optical fiber while entering in to it. This angle is called acceptance angle
Incorrect
To ensure the critical angle incidence in the core-cladding boundary inside the optical fibre, the light should be incident at a certain angle at the end of the optical fiber while entering in to it. This angle is called acceptance angle
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Question 77 of 122
77. Question
Which of the following statement is correct?
1) An endoscope is an instrument used by doctors which has a bundle of optical fibres that are used to see inside a patient’s body.
2) Endoscopes work on the phenomenon of total internal refraction
3) Even operations could be carried out with the endoscope cable which has the necessary instruments attached at their ends.Correct
An endoscope is an instrument used by doctors which has a bundle of optical fibres that are used to see inside a patient’s body. Endoscopes work on the phenomenon of total internal reflection. The optical fibres are inserted in to the body through mouth, nose or a special hole made in the body. Even operations could be carried out with the endoscope cable which has the necessary instruments attached at their ends.
Incorrect
An endoscope is an instrument used by doctors which has a bundle of optical fibres that are used to see inside a patient’s body. Endoscopes work on the phenomenon of total internal reflection. The optical fibres are inserted in to the body through mouth, nose or a special hole made in the body. Even operations could be carried out with the endoscope cable which has the necessary instruments attached at their ends.
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Question 78 of 122
78. Question
The thickness of a glass slab is 0.25 m. it has a refractive index of 1.5. A ray of light is incident on
the surface of the slab at an angle of 60o. Find the lateral displacement of the light when it
emerges from the other side of the mirror(in cm).
Correct
Incorrect
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Question 79 of 122
79. Question
Which of the following statement is correct?
1) The refractions also do take place at spherical surface between two transparent media
2) The laws of refraction hold good at every point on the spherical surface.Correct
The refractions also do take place at spherical surface between two transparent media. The laws of refraction hold good at every point on the spherical surface. The normal at the point of incidence is perpendicular to the tangent plane to the spherical surface at that point.
Incorrect
The refractions also do take place at spherical surface between two transparent media. The laws of refraction hold good at every point on the spherical surface. The normal at the point of incidence is perpendicular to the tangent plane to the spherical surface at that point.
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Question 80 of 122
80. Question
Which of the following assumptions are made while considering refraction at spherical surfaces?
1) The incident light is assumed to be dichromatic
2) The incident light is assumed to be monochromatic
3) The incident ray of light is very close to the principal axisCorrect
The following assumptions are made while considering refraction at spherical surfaces.
(a) The incident light is assumed to be monochromatic (single colour)
(b) The incident ray of light is very close to the principal axis (paraxial rays).Incorrect
The following assumptions are made while considering refraction at spherical surfaces.
(a) The incident light is assumed to be monochromatic (single colour)
(b) The incident ray of light is very close to the principal axis (paraxial rays). -
Question 81 of 122
81. Question
Locate the image of the point object O in the situation shown. The point C denotes the centre of
curvature of the separating surface.Correct
Incorrect
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Question 82 of 122
82. Question
Find the size of the image formed in the given figure.
Correct
Incorrect
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Question 83 of 122
83. Question
Which of the following statement is correct?
- A lens is formed by a transparent material bounded between two spherical surfaces or one plane and another spherical surface
- In a thin lens, the distance between the surfaces is very small.
Correct
A lens is formed by a transparent material bounded between two spherical surfaces or one plane and another spherical surface. In a thin lens, the distance between the surfaces is very small. If there are two spherical surfaces, then there will be two centres of curvature C1 and C2 and correspondingly two radii of curvature R1 and R2.
Incorrect
A lens is formed by a transparent material bounded between two spherical surfaces or one plane and another spherical surface. In a thin lens, the distance between the surfaces is very small. If there are two spherical surfaces, then there will be two centres of curvature C1 and C2 and correspondingly two radii of curvature R1 and R2.
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Question 84 of 122
84. Question
Which of the following statement is correct?
- The primary focus F1 is defined as a point where an object should be placed to give parallel emergent rays to the principal axis
- The secondary focus F2 is defined as a point where all the parallel rays travelling close to the principal axis converge to form an image on the principal axis
Correct
The primary focus F1 is defined as a point where an object should be placed to give parallel emergent rays to the principal axis. For a convergent lens, such an object is a real object and for a divergent lens, it is a virtual object. The distance PF1 is the primary focal length f1 . The secondary focus F2 is defined as a point where all the parallel rays travelling close to the principal axis converge to form an image on the principal axis. For a convergent lens, such an image is a real image and for a divergent lens, it is a virtual image. The distance PF2 is the secondary focal length f 2.
Incorrect
The primary focus F1 is defined as a point where an object should be placed to give parallel emergent rays to the principal axis. For a convergent lens, such an object is a real object and for a divergent lens, it is a virtual object. The distance PF1 is the primary focal length f1 . The secondary focus F2 is defined as a point where all the parallel rays travelling close to the principal axis converge to form an image on the principal axis. For a convergent lens, such an image is a real image and for a divergent lens, it is a virtual image. The distance PF2 is the secondary focal length f 2.
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Question 85 of 122
85. Question
The focal length of the thin lens is taken as___ for a converging lens and___ for a diverging lens.
Correct
The sign of focal length is not decided on the direction of measurement of the focal length from the pole of the lens as they have two focal lengths, one to the left and another to the right (primary and secondary focal lengths on either side of the lens). The focal length of the thin lens is taken as positive for a converging lens and negative for a diverging lens.
Incorrect
The sign of focal length is not decided on the direction of measurement of the focal length from the pole of the lens as they have two focal lengths, one to the left and another to the right (primary and secondary focal lengths on either side of the lens). The focal length of the thin lens is taken as positive for a converging lens and negative for a diverging lens.
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Question 86 of 122
86. Question
Which of the following is lens equation?
Correct
This equation is known as lens equation which relates the object distance u and image distance v with the focal length f of the lens. This formula holds good for a any type of lens
Incorrect
This equation is known as lens equation which relates the object distance u and image distance v with the focal length f of the lens. This formula holds good for a any type of lens
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Question 87 of 122
87. Question
A biconvex lens has radii of curvature 20 cm and 15 cm each. The refractive index of the material
of the lens is 1.5. What is its focal length?(cm)Correct
Incorrect
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Question 88 of 122
88. Question
Determine the focal length of the lens made up of a material of refractive index 1.52 as shown in
the diagram. (Points C1 and C2 are the centers of curvature of the first and second surface.)
Correct
Incorrect
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Question 89 of 122
89. Question
Which of the following statement is correct?
- Power of lens is the measurement of deviating strength of a lens
- Power of the lens is directly proportional to focal length
Correct
Power of lens is the measurement of deviating strength of a lens i.e. when a ray is incident on a lens then the degree with which the lens deviates the ray is determined by the power of the lens. Power of the lens is inversely proportional to focal length i.e. greater the power of lens, greater will be the deviation of ray and smaller will be the focal length.
Incorrect
Power of lens is the measurement of deviating strength of a lens i.e. when a ray is incident on a lens then the degree with which the lens deviates the ray is determined by the power of the lens. Power of the lens is inversely proportional to focal length i.e. greater the power of lens, greater will be the deviation of ray and smaller will be the focal length.
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Question 90 of 122
90. Question
If the focal length is 150 cm for a glass lens, what is the power of the lens?(in D)
Correct
Incorrect
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Question 91 of 122
91. Question
What is the focal length of the combination if a lens of focal length –70 cm is brought in contact
with a lens of focal length 150 cm?
Correct
Given, focal length of first lens, f1 = –70 cm, focal length of second lens, f 2 = 150 cm.
Incorrect
Given, focal length of first lens, f1 = –70 cm, focal length of second lens, f 2 = 150 cm.
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Question 92 of 122
92. Question
What is the focal length of the combination if a lens of focal length –70 cm is brought in contact
with a lens of focal length 150 cm? What is the power of the combination?
Correct
Given, focal length of first lens, f1 = –70 cm, focal length of second lens, f 2 = 150 cm.
Incorrect
Given, focal length of first lens, f1 = –70 cm, focal length of second lens, f 2 = 150 cm.
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Question 93 of 122
93. Question
System of combination of lenses is commonly used in designing lenses for____
- Camera
- Microscope
- Telescopes
Correct
System of combination of lenses is commonly used in designing lenses for cameras, microscopes, telescopes and other optical instruments. They produce better magnification as well as sharpness of the images.
Incorrect
System of combination of lenses is commonly used in designing lenses for cameras, microscopes, telescopes and other optical instruments. They produce better magnification as well as sharpness of the images.
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Question 94 of 122
94. Question
Which of the following statement is correct?
1) A prism is a triangular block of glass or plastic
2) It is bounded by the three plane faces not parallel to each other.
3) Its one face is grounded which is called base of the prism.
4) The other two faces are polished which are called refracting faces of the prismCorrect
A prism is a triangular block of glass or plastic. It is bounded by the three plane faces not parallel to each other. Its one face is grounded which is called base of the prism. The other two faces are polished which are called refracting faces of the prism. The angle between the two refracting faces is called angle of prism (or) refracting angle (or) apex angle of the prism.
Incorrect
A prism is a triangular block of glass or plastic. It is bounded by the three plane faces not parallel to each other. Its one face is grounded which is called base of the prism. The other two faces are polished which are called refracting faces of the prism. The angle between the two refracting faces is called angle of prism (or) refracting angle (or) apex angle of the prism.
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Question 95 of 122
95. Question
Angle of deviation depends on Which of the following factors?
1) Angle of incidence
2) Angle of the prism
3) Material of the prismCorrect
The angle of deviation depends on these following factors:
(i) the angle of incidence
(ii) the angle of the prism
(iii) the material of the prism
(iv) the wave length of the lightIncorrect
The angle of deviation depends on these following factors:
(i) the angle of incidence
(ii) the angle of the prism
(iii) the material of the prism
(iv) the wave length of the light -
Question 96 of 122
96. Question
A monochromatic light is incident on an equilateral prism at an angle 30o and emerges at an angle
of 75o . What is the angle of deviation produced by the prism?
- 30o
- 45o
- 90o
- 60o
Correct
Incorrect
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Question 97 of 122
97. Question
Light ray falls at normal incidence on the first face of an equilateral prism and emerges gracing
the second face. What is the angle of deviation?
- 45o
- 30o
- 60o
- 90o
Correct
Incorrect
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Question 98 of 122
98. Question
Light ray falls at normal incidence on the first face of an equilateral prism and emerges gracing
the second face. What is the refractive index of the material of the prism?Correct
Incorrect
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Question 99 of 122
99. Question
The angle of minimum deviation for a prism is 37o . If the angle of prism is 60o , find the
refractive index of the material of the prism.
Correct
Incorrect
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Question 100 of 122
100. Question
Which of the following statement is correct?
- When white light enter in to a prism, the effect called dispersion takes place.
- Dispersion is splitting of white light into its constituent colours.
- This band of colours of light is called its spectrum.
Correct
So far the angle of deviation produced by a prism is discussed for monochromatic light (i.e. light of single colour). When white light enter in to a prism, the effect called dispersion takes place. Dispersion is splitting of white light into its constituent colours. This band of colours of light is called its spectrum.
Incorrect
So far the angle of deviation produced by a prism is discussed for monochromatic light (i.e. light of single colour). When white light enter in to a prism, the effect called dispersion takes place. Dispersion is splitting of white light into its constituent colours. This band of colours of light is called its spectrum.
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Question 101 of 122
101. Question
Which of the following colour is most deviated?
Correct
When a narrow beam of parallel rays of white light is incident on the face of a prism and the refracted beam is received on a white screen, a band of colours is obtained in the order, recollected by the word: VIBGYOR i.e., Violet, Indigo, Blue, Green, Yellow, Orange and Red. Violet is the most deviated and red is the least deviated colour.
Incorrect
When a narrow beam of parallel rays of white light is incident on the face of a prism and the refracted beam is received on a white screen, a band of colours is obtained in the order, recollected by the word: VIBGYOR i.e., Violet, Indigo, Blue, Green, Yellow, Orange and Red. Violet is the most deviated and red is the least deviated colour.
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Question 102 of 122
102. Question
Which of the following statement is correct?
- The colours obtained in a spectrum depend on the nature of the source of the light used
- Each colour of light is associated with a definite wavelength
Correct
The colours obtained in a spectrum depend on the nature of the source of the light used. Each colour of light is associated with a definite wavelength.
Incorrect
The colours obtained in a spectrum depend on the nature of the source of the light used. Each colour of light is associated with a definite wavelength.
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Question 103 of 122
103. Question
What is the wavelength of violet light?
Correct
Red light is at the longer wavelength end (700 nm) while the violet light is at the shorter wavelength end (400 nm). Therefore the violet ray travels with a smaller velocity in glass prism than red ray.
Incorrect
Red light is at the longer wavelength end (700 nm) while the violet light is at the shorter wavelength end (400 nm). Therefore the violet ray travels with a smaller velocity in glass prism than red ray.
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Question 104 of 122
104. Question
_____ has demonstrated through a classic experiment to produce white light when all the colours
of VIBGYOR are recombined
Correct
Sir Isaac Newton has demonstrated through a classic experiment to produce white light when all the colours of VIBGYOR are recombined. He used a prism to produce dispersion and made all the colours to incident on another inverted prism to combine all the colours to get white light.
Incorrect
Sir Isaac Newton has demonstrated through a classic experiment to produce white light when all the colours of VIBGYOR are recombined. He used a prism to produce dispersion and made all the colours to incident on another inverted prism to combine all the colours to get white light.
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Question 105 of 122
105. Question
Which of the following statement is correct?
- Dispersion takes place because light of different wave lengths travel with different speeds inside the prism
- In Vacuum, all the colours travel with the same speed
Correct
Dispersion takes place because light of different wave lengths travel with different speeds inside the prism. . In Vacuum, all the colours travel with the same speed. The refractive index of two different glasses for different colours.
Incorrect
Dispersion takes place because light of different wave lengths travel with different speeds inside the prism. . In Vacuum, all the colours travel with the same speed. The refractive index of two different glasses for different colours.
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Question 106 of 122
106. Question
Which light has high refractive index?
Correct
In other words, the refractive index of the material of the prism is different for different colours. For violet, the refractive index is high and for red the refractive index is the low.
Incorrect
In other words, the refractive index of the material of the prism is different for different colours. For violet, the refractive index is high and for red the refractive index is the low.
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Question 107 of 122
107. Question
Which of the following statement is correct?
- The speed of light is independent of wavelength in vacuum
- vacuum is a non-dispersive medium in which all colours travel with the same speed
Correct
The speed of light is independent of wavelength in vacuum. Therefore, vacuum is a non-dispersive medium in which all colours travel with the same speed.
Incorrect
The speed of light is independent of wavelength in vacuum. Therefore, vacuum is a non-dispersive medium in which all colours travel with the same speed.
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Question 108 of 122
108. Question
Match the following colour of light with their wavelength(nm)
I. Violet 1. 656.3
II. Blue 2. 589.3
III. Yellow 3. 486.1
IV. Red 4. 396.6Correct
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Incorrect
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Question 109 of 122
109. Question
Find the dispersive power of flint glass if the refractive indices of flint glass for red, green and
violet light are 1.613, 1.620 and 1.632 respectively.
Correct
Incorrect
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Question 110 of 122
110. Question
Which of the following statement is correct?
1) When sunlight enters the atmosphere of the earth, the atmospheric particles present in the atmosphere change the direction of the light
2) This process is known as dispersion of light.Correct
When sunlight enters the atmosphere of the earth, the atmospheric particles present in the atmosphere change the direction of the light. This process is known as scattering of light.
Incorrect
When sunlight enters the atmosphere of the earth, the atmospheric particles present in the atmosphere change the direction of the light. This process is known as scattering of light.
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Question 111 of 122
111. Question
The intensity of Rayleigh’s scattering is inversely proportional to_____ power of wavelength
Correct
If the scattering of light is by atoms and molecules which have size a very less than that of the wave length λ of light a<< λ, scattering is called Rayleigh’s scattering. The intensity of Rayleigh’s scattering is inversely proportional to fourth power of wavelength.
Incorrect
If the scattering of light is by atoms and molecules which have size a very less than that of the wave length λ of light a<< λ, scattering is called Rayleigh’s scattering. The intensity of Rayleigh’s scattering is inversely proportional to fourth power of wavelength.
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Question 112 of 122
112. Question
Which of the following statement is correct?
1) Violet colour which has the shortest wavelength gets much scattered during day time
2) Blue light which has shorter wavelength is scattered away and the less-scattered red light of longer wavelengthCorrect
According to equation, violet colour which has the shortest wavelength gets much scattered during day time. The next scattered colour is blue. As our eyes are more sensitive to blue colour than violet colour the sky appears blue during day time. But, during sunrise and sunset, the light from sun travels a greater distance through the atmosphere. Hence, the blue light which has shorter wavelength is scattered away and the less-scattered red light of longer wavelength manages to reach our eye.
Incorrect
According to equation, violet colour which has the shortest wavelength gets much scattered during day time. The next scattered colour is blue. As our eyes are more sensitive to blue colour than violet colour the sky appears blue during day time. But, during sunrise and sunset, the light from sun travels a greater distance through the atmosphere. Hence, the blue light which has shorter wavelength is scattered away and the less-scattered red light of longer wavelength manages to reach our eye.
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Question 113 of 122
113. Question
The angle of view for violet to red in primary rainbow is___o to____ o
Correct
Primary rainbow is formed when light entering the drop undergoes one total internal reflection inside the drop before coming out from the drop as shown in figure. The angle of view for violet to red in primary rainbow is 40o to 42o.
Incorrect
Primary rainbow is formed when light entering the drop undergoes one total internal reflection inside the drop before coming out from the drop as shown in figure. The angle of view for violet to red in primary rainbow is 40o to 42o.
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Question 114 of 122
114. Question
The angle of view for red to violet in a secondary rainbow is,____o to___ o
Correct
A secondary rainbow appears outside of a primary rainbow and develops when light entering a raindrop undergoes two internal reflections. The angle of view for red to violet in a secondary rainbow is, 52o to 54o.
Incorrect
A secondary rainbow appears outside of a primary rainbow and develops when light entering a raindrop undergoes two internal reflections. The angle of view for red to violet in a secondary rainbow is, 52o to 54o.
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Question 115 of 122
115. Question
Which of the following statement is correct?
- Rainbow is an example of dispersion of sunlight through droplets of water during rainy days.
- When sunlight falls on the water drop suspended in air, it splits (or dispersed) into its constituent six colours
Correct
Rainbow is an example of dispersion of sunlight through droplets of water during rainy days. Rainbow is observed during a rainfall or after the rainfall or when we look at a water fountain provided the sun is at the back of the observer. When sunlight falls on the water drop suspended in air, it splits (or dispersed) into its constituent seven colours.
Incorrect
Rainbow is an example of dispersion of sunlight through droplets of water during rainy days. Rainbow is observed during a rainfall or after the rainfall or when we look at a water fountain provided the sun is at the back of the observer. When sunlight falls on the water drop suspended in air, it splits (or dispersed) into its constituent seven colours.
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Question 116 of 122
116. Question
Assertion(A): If earth has no atmosphere the sky would be dark
Reason(R): If earth has no atmosphere there would not have been any scattering
Correct
If earth has no atmosphere there would not have been any scattering and the sky would appear dark. That is why sky appears dark for the astronauts who could see the sky from above the atmosphere.
Incorrect
If earth has no atmosphere there would not have been any scattering and the sky would appear dark. That is why sky appears dark for the astronauts who could see the sky from above the atmosphere.
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Question 117 of 122
117. Question
Which of the following statement is correct?
- In clouds all the colours get equally scattered irrespective of wavelength
- Rain clouds appear dark because of the condensation of water droplets on dust particles that makes the cloud become opaque
Correct
In clouds all the colours get equally scattered irrespective of wavelength. This is the reason for the whitish appearance of cloud as shown. But, the rain clouds appear dark because of the condensation of water droplets on dust particles that makes the cloud become opaque.
Incorrect
In clouds all the colours get equally scattered irrespective of wavelength. This is the reason for the whitish appearance of cloud as shown. But, the rain clouds appear dark because of the condensation of water droplets on dust particles that makes the cloud become opaque.
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Question 118 of 122
118. Question
Which of the following statement is correct?
1) Light is a form of energy that is transferred from one place to another
2) A glance at the evolution of various theories of light put forward by scientists will give not only an over view of the nature of light but also its propagation and some phenomenon demonstrated by itCorrect
Light is a form of energy that is transferred from one place to another. A glance at the evolution of various theories of light put forward by scientists will give not only an over view of the nature of light but also its propagation and some phenomenon demonstrated by it.
Incorrect
Light is a form of energy that is transferred from one place to another. A glance at the evolution of various theories of light put forward by scientists will give not only an over view of the nature of light but also its propagation and some phenomenon demonstrated by it.
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Question 119 of 122
119. Question
Who among the following gave Corpuscular theory?
Correct
Sir Isaac Newton (1672) gave the corpuscular theory of light which was also suggested earlier by Descartes (1637) to explain the laws of reflection and refraction.
Incorrect
Sir Isaac Newton (1672) gave the corpuscular theory of light which was also suggested earlier by Descartes (1637) to explain the laws of reflection and refraction.
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Question 120 of 122
120. Question
Which of the following statement is correct?
1) According Corpusculartheory, light is emitted as tiny, massless (negligibly small mass) and perfectly elastic particles called corpuscles
2) As the corpuscles are very small, the source of light does not suffer appreciable loss of mass even if it emits light for a long timeCorrect
According this theory, light is emitted as tiny, massless (negligibly small mass) and perfectly elastic particles called corpuscles. As the corpuscles are very small, the source of light does not suffer appreciable loss of mass even if it emits light for a long time. On account of high speed, they are unaffected by the force of gravity and their path is a straight line in a medium of uniform refractive index.
Incorrect
According this theory, light is emitted as tiny, massless (negligibly small mass) and perfectly elastic particles called corpuscles. As the corpuscles are very small, the source of light does not suffer appreciable loss of mass even if it emits light for a long time. On account of high speed, they are unaffected by the force of gravity and their path is a straight line in a medium of uniform refractive index.
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Question 121 of 122
121. Question
The energy of light is the____ energy of corpuscles
Correct
On account of high speed, they are unaffected by the force of gravity and their path is a straight line in a medium of uniform refractive index. The energy of light is the kinetic energy of these corpuscles. When these corpuscles impinge on the retina of the eye, the vision is produced.
Incorrect
On account of high speed, they are unaffected by the force of gravity and their path is a straight line in a medium of uniform refractive index. The energy of light is the kinetic energy of these corpuscles. When these corpuscles impinge on the retina of the eye, the vision is produced.
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Question 122 of 122
122. Question
Which of the following phenomena cannot be explained by corpuscular theory?
Correct
Corpuscular theory could not explain the reason why the speed of light is lesser in denser medium than in rarer medium and also the phenomena like interference, diffraction and polarisation.
Incorrect
Corpuscular theory could not explain the reason why the speed of light is lesser in denser medium than in rarer medium and also the phenomena like interference, diffraction and polarisation.
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