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The refractive index is represented by-

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Detailed Solution

The refractive index is represented by µ.
The ratio of the speed of light in air or vacuum to the speed of light in another medium is the refractive index of the medium. It is denoted by the Greek letter μ. It can be written as

μ = \frac{speed of light in air or vacuum}{speed of light in the medium}

Refractive index has no unit since it is a pure ratio.

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