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Class 12 Physics (Part Ii) Chapter 9 Ray Optics And Optical Instruments Quiz 3 (25 MCQs)

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1. The air bubble inside water shine due to
2. According to Newton's corpuscular model, what are corpuscles?
3. While capturing solar energy for commercial purposes we use
4. Even in absolutely clear water, a diver cannot see very clearly:
5. 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:
6. What is the term for the phenomenon where the right side of an object appears as the left side in a mirror?
7. A Convex mirror of focal length f produces an image magnified m times. The distance of the object from the mirror is
8. 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?
9. 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
10. A glass lens is immersed in water. What will be the effect on the power of lens?
11. What is the wavelength range of light as defined in the text?
12. The power of a thin convex lens of glass is 5 D. When it is immersed in a liquid, then it behaves like a divergent lens of focal length 100 cm. The refractive index of the liquid is:(Given, refractive index of glass = $\mu$ = 1.5)
13. If two mirrors are inclined at some angle an object is placed between the mirrors and there are seven images formed for an object. Then, what is an angle between the mirrors?
14. A lens behaves as a converging lens in air and as a diverging lens in water. The refractive index of the material is:
15. What is the critical angle for glass?
16. An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Which one of the following is not possible?
17. A Thin lens of focal length f and its aperture has diameter d. it forms an image of intensity 3. Now the central part of aperture upto diameter d/2 is blocked by an opaque paper. The focal length and image intensity would change to
18. What is the main purpose of a telescope?
19. What is the formula for the lens maker's equation?
20. A passenger in an aeroplane shall
21. What is the main reason for the brilliance of diamonds?
22. Two lenses of focal lengths 20 cm and-40 cm are held in contact. If an object lies at infinity, image formed by the lens combination will be a
23. When a thin convex lens is put in contact with a thin concave lens of the same focal length, the resultant combination had focal length equal to:
24. What is the term for the distance between two nearby objects that can be resolved by an optical instrument?
25. An object approaches a convergent lens from the left of the lens with a uniform speed 5 m/s and stops at the focus. The image
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