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Class 12 Physics (Part Ii) Chapter 9 Ray Optics And Optical Instruments Quiz 4 (25 MCQs)

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1. What type of lens is thicker at the edges and thinner in the middle?
2. A convex mirror has a focal length f. A real object is placed at a distance f in front of it, from the pole. It produces an image at
3. The radius of curvature of the convex surface of a plano-convex lens, whose focal length is 0.3m & the refractive index of material is 1.5 is
4. The focal length of a biconvex lens of radii of each surface 50 cm and refractive index 1.5, is
5. What is the effect of increasing the radius of curvature of a lens on its focal length?
6. Refractive index of water is 5/3. A light source is placed in water at a depth of 4 m. Then what must be the maximum radius of disc placed on water surface so that the light of source can be stopped?
7. The magnifying power of an astronomical telescope in normal adjustment is 100. The distance between the objective and the eyepiece is 101 cm. The focal length of the objectives and eyepiece is
8. Optical fibres use the phenomenon of:
9. What is the primary purpose of using optical fibers?
10. What is the refractive index of water as mentioned in the text?
11. A convergent double of separated lens, corrected for spherical aberration, are separated by 2 m and has an equivalent focal length of 10 cm. Calculate the focal length of its component lenses.
12. A glass lens is immersed in water. Its power will
13. Total internal reflection occurs when
14. In the minimum deviation position, the refracted ray in the prism is
15. 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 wil
16. An equilateral prism deviates a ray through 45$^\circ$ for the two angle of incidence differing by 20$^\circ$. The angle of incidence is
17. Focal length of the objective and eyepiece of a telescope are respectively 50 cm and 5 cm. The magnifying power of the telescope in its normal adjustment is
18. At the minimum deviation of condition in a prism
19. An object 2.4m in front of a lens form a sharp image on a film 12 cm behind the lens. A glass plate 1 cm thick, of refractive index 1.50 is interposed between lens and film with its plane faces parallel to film. At what distance (from lens) should object shifted to be in sharp focus on film?
20. A rectangular block of glass ABCD has a refractive index 1.6.A pin is placed midway on the face AB (Fig. 9.4). When observed from the face AD, the pin shall
21. What phenomenon occurs when light travels from a denser medium to a rarer medium at an angle greater than the critical angle?
22. A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
23. Objects are visible in light due to:
24. Digital movie projectors work on the principle of
25. Two convex lenses are separated by a distance equal to the sum of their focal lengths. A beam of light parallel to the principal axis incidence on one of the lenses. They will emerge from the second lens as
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