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Class 12 Physics (Part Ii) Chapter 9 Ray Optics And Optical Instruments Quiz 1 (25 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?
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