# How is the Refractive Index of a Material Related to the Velocity of Light in Vacuum Or Air and the Velocity of Light in a Given Medium? - Physics

How is the refractive index of a material related to the velocity of light in vacuum or air and the velocity of light in a given medium?

#### Solution

Refractive index is the ratio of the velocity of light in the vacuum to the velocity of light in a medium.

mu  = c/v

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