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Class 12 Physics (Part Ii) Chapter 9 Ray Optics And Optical Instruments Quiz 1 (60 MCQs)

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1. The characteristic feature of light which remains unaffected on refraction is
2. A man stands in front of a mirror of special shape. He finds that his image has a very small head, a fat body, and legs of normal size. What can we say about the shapes of the three parts of the mirror?
3. Which of the following is not a property of light?
4. What is the effect on the image distance when the object distance is decreased for a convex lens?
5. Day and night settings for rearview mirrors uses
6. Two beams of red and violet color are made to pass separately through a prism (angle of the prism is 60$^\circ$). In the position of minimum deviation, the angle of refraction will be
7. A telescope consist of two lenses of focal lengths 10 cm and 1 cm. Calculate the length of telescope, when an object is kept at distance of 60 cm from the objective, and the final image is formed is at least distance of distinct vision.
8. In the context of image formation by a concave mirror, what does a negative image distance (v) indicate?
9. What is the formula for the mirror equation?
10. When a light ray from a rarer medium is refracted into a denser medium, its
11. An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Then
12. An astronomical telescope has a large aperture to
13. How does the focal length of a convex lens changes if mono chromatic red light is used instead of violet light?
14. An object is placed at a distance of 40 cm from a concave mirror of focal length 15 cm. If the object is displaced through a distance of 20 cm towards the mirror, the displacement of the image will be:
15. What is the resolving power of an optical instrument?
16. The equivalent focal length of a combination of a convex and a concave length is
17. When a telescope is adjusted for normal vision, the distance of the objective from the eye-piece is found to be 80 cm. The magnifying power of the telescope is 19. What are the focal lengths of the lenses?
18. A concave lens of focal length f produces an image 1/$\mu$ times the size of the object. The distance of the object from the lens is:
19. According to the Cartesian sign convention, which of the following distances is considered positive?
20. What is the relationship between the diameter of the lens and the amount of light entering a camera?
21. A short pulse of white light is incident from air to a glass slab at normal incidence. After travelling through the slab, the first colour to emerge is
22. What is the power of a lens measured in?
23. When length of a microscope tube increases, its magnifying power:
24. Two thin lenses with focal lengths of 20 cm and 25 cm are placed in contact. The effective power of the combination is:
25. What phenomenon causes the colors observed in a thin film of oil on water?
26. What is the angular magnification of a telescope when the final image is formed at infinity?
27. What type of image is formed by a concave mirror when the object is placed between the pole and focus?
28. Find the position of 1 cm tall object which is placed 8 cm in front of convex mirror of radius of curvature 24 cm.
29. What defect of vision is corrected by a concave lens?
30. A convergent lens will become less convergent in:
31. What is the magnification formula for a mirror?(I=height of image and O=height of object)
32. The magnification of a compound microscope is 30 and the focal length of its eye piece is 5m. Calculate the magnification produced by the objective, when the image is to be formed at least distance of distinct vision (25 cm).
33. What type of reflection occurs when light rays are reflected from a rough surface?
34. When a convex lens placed inside a transparent medium of refracting index greater than that of its own material
35. An object approaches a convergent lens from the left of the lens with uniform speed 5 m/s and stops at the focus. The image
36. What happens to the image when the lower half of a concave mirror is covered with an opaque material?
37. An object placed in front of a concave mirror of focal length 0.15 m produces a virtual image, which is twice the size of the object. The position of the object with respect to the mirror is
38. How does the refractive index of a medium relate to the speed of light in that medium?
39. What happens to the image formed by a convex mirror?
40. For the same value of angle of incidence, the angles of refraction in three media A, B and C are 15$^\circ$, 25$^\circ$ and 35$^\circ$ respectively. In which medium would the velocity of light be minimum?
41. The radii of curvatures of each of the surfaces of a convex lens (refractive index of the material is 1.5) is 20 cm. The focal length of the lens in air is
42. A thin equiconvex glass lens of refractive index 1.5 has power of 5D. When the lens is immersed in a liquid of refractive index $\mu$, it acts as a divergent lens of focal length 100 cm. The value of $\mu$ of liquid is .....
43. Which of the following is possible application of fibre optics?
44. A person looks into a concave mirror and sees a larger image of themselves. What can we infer about the position of the object relative to the focal point of the mirror?
45. If the critical angle for total internal reflection from a medium to vacuum is 30$^{o}$, the velocity of light in the medium is
46. Two lenses of focal lengths 20 cm and-40 cm are held in contact. The image of an object at infinity will be formed by the combination at
47. What is the critical angle for total internal reflection?
48. What type of aberration causes blurring of images due to rays not focusing at a single point?
49. A microscope has an objective of 5mm focal length and eye piece of 30 mm focal length and the distance between them is 150 mm. The magnification is:
50. When a ray of light goes from a rarer medium into a denser medium, then:
51. The air bubble inside water shine due to
52. According to Newton's corpuscular model, what are corpuscles?
53. While capturing solar energy for commercial purposes we use
54. Even in absolutely clear water, a diver cannot see very clearly:
55. The refractive indices (R.I.) of glass and water with respect to air are 3/2 and 4/3 respectively. The R.I. of glass w.r.t. to water is:
56. What is the term for the phenomenon where the right side of an object appears as the left side in a mirror?
57. A Convex mirror of focal length f produces an image magnified m times. The distance of the object from the mirror is
58. Two concave mirrors have the same focal length but the aperture of one is larger than that of the other. Which mirror forms the sharper image?
59. The focal length of plano-convex lens, the convex surface of which is slivered is .3m, if $\mu$ of the lens is 7/4, the radius of curvature of the convex surface is
60. A glass lens is immersed in water. What will be the effect on the power of lens?
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