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Light--Class-X- Vasu Classes

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1. What is the magnification of the image formed by a plane mirror? a) +1 b) -1 c) <1 d) >1

2. Light has dual nature a) True b) False

3. What are the characteristics of the image formed by a plane mirror? a) Virtulal ,same size b) Real , double size c) Real , same size .laterally inverted d) Virtual ,same siaze , laterrally inverted

4. If the height of a person is 6 feet , the minimum height of the mirror required to see the full image a) 4 feet b) 3 feet c) 6 feet d) around 7 feet

5. Which mirror is used a back view mirror? a) concave mirror b) plane mirror c) convex mirror

6. What is the magnification of the image formed by a concave mirror when the object is at C? a) +1 b) -1 c) <1 d) >-2

7. When the object is between Pole and Focus in front of a convex mirror the image is formed a) In front of the mirror b) Behind the mirror c) At Focus d) At C

8. Which mirror is used by ENT? a) concave mirror b) Convex mirroe c) plane mirror d) parabolic mirror

9. Which mirror has larger field of view? a) plane mirror b) concave mirror c) convex mirror d) B & C

10. The ratio of the light rays of wavelength 5000A and 7000A in air is a) 7:5 b) 5:7 c) 3:2 d) 1:1

11. Monochromatic light of wavelength 500nm incidentfrom air to glass. If R.I.f glass is 1.5. The wavelength of light in the glass will be a) 433nm b) 444nm c) 333nm d) None

12. An object of height 6cm is placed at a distance of 20cm in front of a concave lens of power 8D. The size of image will be a) 3.2cm b) 5cm c) 6cm d) 2.3cm

13. One lower half of a convex lens is covered with a black paper. This lens will produce a) image of half of the object b) full image c) full image of less intensity d) half image of full intensity

14. The magnification of an image is half . Which of the following set can give this result? a) convex mirror , concave lens b) concave mirror , convex lens c) concave lens , convex lens d) plane mirror , convex mirror

15. If a light ray incidents at an angle of 30 degree to a plane , what will be the angle of deviation a) 30 degree b) 60 degree c) 120 degree d) 50 degree

16. A spherical mirror and and a thin spherical lens have each a focal length of -15cm. The mirror and the lens are likely to be a) both concave b) both convex c) mirror-concave, lens-convex d) mirror-convex, lens-concave

17. m=(v/f-1) Which of the following lens would you prefer to read the letters of a book a) concave lens of focal length 5cm b) convex lens of focal length 5cm c) concave lens of focal length 40cm d) convex lens of focal length 40cm

18. A concave mirror produces an image three thimes the size of object. If object is placed at a distance of 10cm from the pole. Where is image located? a) -40cm b) -60cm c) -30cm d) 10cm

19. Which of the following material can't be used to make a lens a) clay b) water c) glass d) plastic

20. The refraction of light does not occur when it goes a) from rare to optically denser medium b) optically denser to rare medium c) one medium to another medium of same optical density d) depends of speed of light ray

21. Light travels slowest in a) Vacuum b) Diamond c) Glass d) air

22. Which principle is used in optical fibres a) scattering of light b) reflection of light c) refraction of light d) Total internal reflection of light

23. A concave mirror produces three times magnified real image of an object placed at a distance of 10cm infront of it. Where is the image located a) -60cm b) 20cm c) 50cm d) -30cm

24. Which of the following letters will show lateral inversion in a plane mirror a) M b) A c) N d) O

25. The image of a distant object is formed by a concave mirror is obtained on the screen. The focal length of the mirror will be the distance between a) the object and the mirror b) the object and the screen c) the mirror and the screen d) B and C

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