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Class 12 Physics: Ray Optics and Optical Instruments
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MCQs on light reflection using spherical mirrors, refraction, total internal reflection, refraction through prism and lenses, natural phenomena due to sunlight and optical instruments.

Class 12 Physics: Ray Optics and Optical Instruments
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25 Questions

1. Pick out the formula for dispersive power from the following.
2. 'X' is an optical illusion observed in deserts or over hot extended surfaces like a coal-tarred road, due to which a traveler sees a shimmering pond of water some distance ahead of him and in which the surrounding objects like trees appear inverted. Identify X.
3. Which of the following is a necessary condition for total internal reflection?
4. How much intensity of the image is increased if the diameter of the objective of a telescope is doubled?
5. What is the cause of the blue color of the ocean?
6. Which among the following relates scattering and wavelength of the particle?
7. Calculate the refractive index of the material of an equilateral prism for which the angle of minimum deviation is 60°.
8. A boy uses spectacles of focal length -50 cm. Name the defect of the vision he is suffering from.
9. Which of the following causes refraction of light?
10. Calculate the dispersive power of crown glass where μV=1.456 and μR=1.414.
11. X is thicker in the middle than at the edges, whereas, Y is thicker at the edges than in the middle. Identify 'X' and 'Y'.
12. Identify the Lens Maker's Formula.
13. Identify the prism formula from the following.
14. If the radius of curvature of each face of the biconcave lens, made of glass of refractive index 1.25 is 50 cm, then what is the focal length of the lens in air?
15. Identify the factor on which the angle of deviation of the prism does not depend.
16. 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?
17. Can the relative refractive index of a medium w.r.t. another medium be less than unity?
18. What will be the color of the sky in the absence of the atmosphere?
19. A thin prism with an angle of 3o and made from glass of refractive index 1.15 is combined with another prism made from glass and has a refractive index of 1.45. If the dispersion were to occur without deviation then what should be the angle of the second prism?
20. Calculate the focal length of a biconvex lens if the radii of its surfaces are 50 cm and 20 cm, and index of refraction of the lens glass = 1.2.
21. Which of the following is Cauchy's formula?
22. What is the condition for dispersion without deviation?
23. A lens has a focal length of 10 cm. Where the object should be placed if the image is to be 40 cm in the positive direction from the lens?
24. What is the angle between the incident ray and the emergent ray in a prism called?
25. What happens to the shining of diamond if it is dipped in a transparent oil?

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