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Class 10 Science Chapter 10 Light Reflection And Refraction Quiz 4 (29 MCQs)

Quiz Instructions

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1. An object that absorbs light is called a
2. A spherical mirror and a thin spherical lens have focal length of-20 cm. The mirror and lens will be:
3. An object AB is placed in front of a convex Lens at its principal focus The image will be formed at
4. A boy is standing in front of and close to a special mirror. He finds the image of his head bigger than normal, the middle part of his body of the same size, and his legs smaller than normal. The special mirror is made up of three types of mirrors in the following order from top downwards:(a) Convex, Plane, Concave (b) Plane, Convex, Concave (c) Concave, Plane, Convex (d) Convex, Concave, Plane
5. The velocity of light in vacuum is ..... m/s
6. In an experiment with a rectangular glass slab, a student observed that a ray of light incident at an angle of 55$^\circ$ with the normal on one face of the slab, after refraction strikes the opposite face of the slab before emerging out into air making an angle of 40$^\circ$ with the normal. What value would you assign to the angle of refraction and angle of emergence?
7. The law of reflection states that
8. A concave mirror forms a point sized image for a object at
9. When an object moves closer to a concave lens, the Image formed by it shifts
10. Myopia can be removed by using a lenses of
11. Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?
12. A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm. The distance of the object from the mirror is
13. The type of mirror used in reflector in automobile lights is
14. When light falls on a smooth polished surface, most of it
15. The relation between focal length and radius of curvature is
16. Light has the lowest velocity in which medium?flint glass n=1.70barium glass n=1.60crown glass n=1.523water n=1.33diamond n=2.45
17. The refractive index of glass for light going from air to glass is 3/2. The refractive index for light going from glass to air will be:(a) 1/3 (b) 4/5 (c) 4/6 (d) 5/2
18. A ray of light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:(a) 0$^\circ$ (b) 45$^\circ$ (c) 90$^\circ$ (d) 120$^\circ$
19. Virtual images formed by a convex mirror are always .....
20. A concave mirror gives virtual, refract and enlarged image of the object but image of smaller size than the size of the object is
21. To get real magnified image in convex lens, the object position is
22. What is the cause of refraction of light?
23. The Laws of Reflection are applicable to which of the following?
24. The angle between an incident ray and the plane mirror is 30$^\circ$. The total angle between the incident ray and reflected ray will be:(a) 30$^\circ$ (b) 60$^\circ$ (c) 90$^\circ$ (d) 120$^\circ$
25. Size of image of an object by a mirror having a focal length of 20 cm is observed to be reduced to 1/ 3rd of its size. At what distance the object has been placed from the mirror? What is the nature of the image and the mirror?(use for concave mirror)
26. A convex lens has a focal length of 10cm. What is its power?
27. What kind of image can be obtained on a screen
28. The image formed by a plane mirror is:(a) virtual, behind the mirror and enlarged. (b) virtual, behind the mirror and of the same size as the object. (c) real, at the surface of the mirror and enlarged. (d) real, behind the mirror and of the same size as the object.
29. A doctor has prescribed a corrective lens of power +1.5 D. Find the focal length of the lens. Is the prescribed lens diverging or converging?
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