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Class 10 Science Chapter 10 Light Reflection And Refraction Quiz 7 (25 MCQs)

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1. An illuminated object is placed at a distance of 20 cm from a converging lens of focal length 15 cm. The image obtained on the screen is:(a) upright and magnified (b) inverted and magnified (c) inverted and diminished (d) upright and diminished
2. What sign is given to the focal length of a concave mirror
3. The minimum distance between an object and its real image formed by a convex lens of focal length f is-
4. An object is placed in between two plane mirrors whose reflecting surfaces are placed facing parallel to each other. Infinite images of the object are formed but only a few are visible because:
5. When light passes from air to water, what happens to the speed of the light?
6. If a magnification of, -1 (minus 1) is obtained by using a converging lens, then the object has to be placed:(a) within f (b) at 2f (c) beyond 2f (d) at infinity
7. The deviation of light ray from its path when it travels from one transparent medium to another transparent medium is called
8. A ray of light is travelling from a rarer medium to a denser medium. While entering the denser medium at the point of incidence, it
9. If the power of a lens is-2 D, what is its focal length?
10. Which of the following mirror is used by a dentist to examine a small cavity?
11. Which of the following mirrors is used by Archimedes to burn the ships?
12. Convex lens focus a real, point sized image at focus, the object is placed
13. No matter how far you stand from a spherical mirror, your image appears erect. The mirror may be plane or convex mirror.
14. What is refraction of light?
15. In torches, search lights and headlights of vechicles the buld is placed
16. An object at a distance of 30 cm from aconcave mirror gets its image at the same point. The focal length of the mirror is
17. What three things may happen to light that strikes an object?
18. Give an example of a situation where refraction of light occurs.
19. Where will be the images of the Sun or the moon are formed by a concave mirror?
20. A mirror having focal length-15 cm is .....
21. The optical phenomena, twinkling of stars, is due to
22. A clock hung on a wall has marks instead of numbers on its dial. On the opposite wall there is a mirror, and the image of the clock in the mirror if read, indicates the time as 8.20. What is the time in the clock-
23. A spherical mirror and a spherical lens each have a focal length of-10 cm. The mirror and the lens are likely to be
24. A concave mirror has a focal length of 25 cm. A person wants to see his face in this mirror. At what distance should the person stand?
25. First law of reflection states that the angle of incidence is ..... angle of reflection.
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