Speed of light in water and in glass is 2 . 24 × 10 8 ms - 1 and 2 . 0 × 10 8 ms - 1 respectively. What is the refractive index of water with respect to glass?

Refractive index is the ratio of speed of light in vacuum to the speed of light in a medium. Thus, μ = c v . The relative refractive index of second medium with respect to first medium is defined as μ 2 1 = 1 μ 1 2 . Since c is a constant, μ ∝ 1 v ∴ μ w g = 1 μ g w = μ w μ g = v g v w = 2 × 10 8 2 . 24 × 10 8 = 0 . 89

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 7

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Absolute refractive index of diamond is $2.4$ . What is the speed of light in diamond?

Important Questions on Refraction at Plane Surfaces

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 8

Speed of light in water and in glass is

2.24 \times 10^{8} {ms}^{- 1}

and

2.0 \times 10^{8} {ms}^{- 1}

respectively. What is the refractive index of water with respect to glass?

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 9

Calculate the time taken by a light ray when it passes through a glass sheet of thickness

2 mm

. Given refractive index of glass with respect to air

({}_{a}μ_{g}) = \frac{3}{2}

and

c = 3.0 \times 10^{8} {ms}^{- 1}

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 10

What do you mean by refraction of light? What causes refraction of light?

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 11

Complete the following ray diagrams by showing reflecting and refracting light rays.

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 12

When a light falls obliquely on a glass surface it bends towards normal but when it moves out from the surface it moves away from the normal. Why? Name this phenomenon of light.

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 13

State whether the light ray in the following diagram is moving from glass to water or vice versa. Give reason for your reason.

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S CHAND'S ICSE PHYSICS BOOK 2>Chapter 4 - Refraction at Plane Surfaces>QUESTIONS>Q 14

The figure below shows refraction of a light ray from a glass slab. Write the values of angle $x$ and $y$ . What is the refractive index of the slab material?

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