What name is given to the ratio of sine of angle of incidence to the sine of angle of refraction?

The name given to the ratio of sine of angle of incidence to the sine of angle of refraction is refractive index. It is a constant value.

Explanation

 In optics, the Refractive index, also called the index of refraction, is the measurement of fast bending rays of light when passing from one medium into another.

It is defined as the velocity of light ‘c’ in the vacuum divided by its velocity ‘v’ in the medium.

$Refractive\ index\ of\ a\ medium$ $=\frac{\text {Speed of light in vacuum}}{\text {Speed of light in medium}}$

Also, given as-

$n=\frac{c}{v}$

where,  n = refractive index, c = speed of light in vacuum and v = the phase velocity of light in the medium.

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Updated on: 10-Oct-2022

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