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10. Light - Reflection and Refraction
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Q6 of 117 Page 10

Define 1 Dioptre of power of a lens.

1 Dioptre is the power of a lens whose focal length is 1m.

i.e.

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4

What does the negative sign in the value of magnification produced by a mirror indicates about an image?

5

Given below are refractive indices of a few material media.

Rock salt - 1.54


Ice - 1.31


Dense flint glass - 1.65


Crown glass - 1.52


Arrange the media in the ascending order of optical density.

7

Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? 1 speed of light in vacuum is 3 x 108 m s-1

8

You are given kerosene, turpentine and water. In which of these the light travels fastest?

Questions · 117
10. Light - Reflection and Refraction
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