CBSE Class 10 Science 2019 · Paper 31/1/1/C · Question 5(a)

Light - Reflection and Refraction 2 marks Easy

State Snell’s law of refraction of light. Write an expression for the absolute refractive index of a medium in terms of speed of light.

Answer

Snell's law: $\frac{s i n i}{s i n r}$ is constant for a given pair of media; the absolute refractive index is $n_{m} = \frac{c}{v}$ .

Snell's law: the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for light of a given colour and a given pair of media:

\frac{s i n i}{s i n r} = constant = n_{21}

. Absolute refractive index of a medium:

n_{m} = \frac{c}{v}

, where

c

is the speed of light in vacuum and

v

is the speed of light in the medium.

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CBSE Class 10 Science 2019 · Paper 31/1/1/C · Question 5(a)

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