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Class 10 Science Chapter 10 Light Reflection And Refraction Quiz 4 (25 MCQs)

Quiz Instructions

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1. Refractive index of a medium with respect to vacuum is called
2. 3 times magnified and erect image is formed by a concave mirror of focal length 20cm and radius of curvature 40cm. The object is placed between ..... cm and ..... cm from the pole
3. Which of the following can make a parallel beam of light when light from a point source is incident on it?
4. $\frac{1}{v}+\frac{1}{x}=\frac{1}{f}$
5. When light goes from one material(medium) to another it becomes bent, what term means bent?
6. What happens to the speed of light when it enters a medium with a higher refractive index?
7. Two objects A and B when placed in turn in front of a concave mirror of focal length 7.5 cm, give images of equal size. If A is three times the size of B and is placed 30 cm from mirror, what is the distance of B from the mirror-
8. Lens formula is given as
9. Power of the lens is-5D, its focal length is
10. Second law of reflection states that angle of incidence and angle of reflection is
11. How is light affected by an increase in the index of refraction?
12. When light hits an area and bounces back it is called:
13. What does refraction mean?
14. If an incident ray passes through the focus, the reflected ray will
15. In which of the following, the image of an object placed at infinity will be highly diminished and point sized?
16. Which of the following is not the characteristics of the image formed on a plane mirror?
17. The ratio of the refractive index of red light to blue light in air is
18. Under what condition will a glass lens placed in a transparent liquid become invisible?
19. A positive sign in the value of magnification indicates that the image is
20. What is the mirror formula?
21. A ..... mirror is used as a head mirror by the doctors to concentrate light on the body parts to be examined.
22. What is the formula for calculating refractive index?
23. An object is placed 40.0 cm in front of a convex mirror. The image appears 15 cm behind the mirror. What is the focal length of the mirror?
24. What is the critical angle in the context of light refraction?
25. When the light passes out of the glass, back into the air
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