Question

what is meant by refractive index​

Answer 1

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. where c is the speed of light in vacuum and v is the phase velocity of light in the medium.

Answer 2

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The refractive index of the second medium with respect to the first medium is given by the ratio of the magnitude of the velocity of light in medium first to that in 2nd medium.

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