Question

Define refrective index​

Answer 1

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In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how fast light propagates through the material. It is defined as n=c/v, where c is the speed of light in vacuum and v is the phase velocity of light in the medium. For example, the refractive index of water is 1.333, meaning that light travels 1.333 times as fast in vacuum as in water. The refractive index determines how much the path of light is bent, or refracted, when entering a material.

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Answer 2

Explanation:

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Ratio of Sin I and Sin R is Constant. This is called Refractive Index.

RI = Sin I / Sin R

Refractive Index is also the ratio of velocity of light in vacuum and velocity of light in medium.