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Snell's Law

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Question

What happens to the speed of light when it undergoes refraction in a medium ? Hence define absolute refractive index of a medium.

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Solution

When the light undergoes refraction, its speed changes. The changed speed can be calculated if the absolute refractive index of that medium is given.
The absolute refractive index of a medium is equal to the ratio of the speed of light in air/vacuum and speed of light in that medium.

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Similar questions

v_{1}, v_{2}

c

represent the speed of light in medium

1

2

, and vacuum respectively, write the expression for
a)absolute refractive index of medium

1

b)absolute refractive index of medium

2

Hence show that,

η_{2} = \frac{v_{1}}{v_{2}}

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