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Class 10 Science Chapter 10 Light Reflection And Refraction Quiz 8 (25 MCQs)

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1. A ray of light is incident normally on a rectangular piece of glass. The value of angle of refraction will be-
2. A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl pin is formed at 30 cm in front of the mirror. The focal length of this mirror is
3. The speed of light in substance X is $1.25\times10^8$ $3\times10^8$
4. What is the SI unit of power of a lens?
5. An object that allows light to go through ..... light.
6. What does reflection mean?
7. State Snell's Law.
8. What is the angle between the incident and reflected rays when a ray of light is incident normally on a plane mirror?
9. An object that absorbs light is called a
10. A spherical mirror and a thin spherical lens have focal length of-20 cm. The mirror and lens will be:
11. An object AB is placed in front of a convex Lens at its principal focus The image will be formed at
12. 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
13. The velocity of light in vacuum is ..... m/s
14. 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?
15. The law of reflection states that
16. A concave mirror forms a point sized image for a object at
17. When an object moves closer to a concave lens, the Image formed by it shifts
18. Myopia can be removed by using a lenses of
19. Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?
20. 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
21. The type of mirror used in reflector in automobile lights is
22. When light falls on a smooth polished surface, most of it
23. The relation between focal length and radius of curvature is
24. 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
25. The formula to calculate the refractive index is
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