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Class 12 Physics (Part Ii) Chapter 9 Ray Optics And Optical Instruments Quiz 5 (25 MCQs)

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1. What is the power of a lens with a focal length of 0.5 m?
2. In a simple microscope, if the focal length of the convex lens is 5 cm, what is the maximum magnification achievable?
3. A man runs towards a mirror at a rate of 6 m/s if we assume the mirror to be at rest, the image will have velocity-
4. The radius of curvature of the curved surface of a plano-convex lens is 20 cm. If the refractive index of the material of the lens be 1.5, it will
5. A convex lens and a concave lens, each having the same focal length of 25 cm, are put in contact to form a combination of lenses. The power of the combination (in dioptres) is
6. A compound microscope has an eyepiece of focal length 10 cm and an objective of focal length 4 cm. Calculate the magnification if an object is kept at a distance of 5 cm from the objective, then the final image is formed at the least distance of distinct vision.
7. What is the effect of increasing the angle of incidence on the angle of refraction?
8. A convergent lens made of crown glass has focal length 20cm in air. If it is immersed in a liquid of refractive index 1.60, its focal length will be
9. A thin prism of 12$^\circ$ angle gives a deviation of 6$^\circ$. The refracting index of a material of the prism
10. What is the refractive index of water?
11. The shortest height of a vertical mirror required to see the entire image of a man will be
12. Find the change in the focal length of the lens, if a convex lens of focal length 20 cm and refractive index 1.5, is emerged in water having refractive index 1.33.
13. The magnifying power of an astronomical telescope can be increased if we:
14. What is the primary function of the ciliary muscles in the human eye?
15. Tara is experimenting with a glass prism in her science lab. She shines a beam of light through the prism and observes the different colors that emerge. She notices that the angle of deviation for the colors varies. Which color does she find has the greatest angle of deviation?
16. What is the focal length of a plane mirror?
17. The direction of ray of light incident on a concave mirror is shown by PQ while directions in which the ray would travel after reflection is shown by four rays marked 1, 2, 3 and 4(Fig 9.1). Which of the four rays correctly shows the direction of reflected ray?
18. What is the relationship between the focal length (f) and the radius of curvature (R) of a concave mirror?
19. What type of optical instrument uses two lenses to observe distant celestial objects?
20. What is the term for the splitting of white light into its constituent colors?
21. What is the relationship between the object distance (u), image distance (v), and focal length (f) for a lens?
22. What is the phenomenon of light bending as it passes from one medium to another called?
23. The phenomena involved in the reflection of radiowaves byionosphere is similar to
24. What is the angular magnification of a simple microscope when the image is at the near point?
25. When light is refracted into a medium,
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