What is the relation between the refractive index of a medium and the speed of light through it?

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\frac{Speed of light in vacuum}{Speed of light in medium}

\frac{Speed of light in  medium}{Speed of light in vacuum}

\frac{Speed of light in air}{Speed of light in medium}

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answer is A.

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Detailed Solution

The relation between the refractive index of a medium and the speed of light through it is Refractive index =

\frac{Speed of light in vacuum}{Speed of light in medium}

Refractive index is defined as the ratio of the speed of light in a vacuum to the speed of light in the medium.
Mathematically,
Refractive index =

\frac{Speed of light in vacuum}{Speed of light in medium}

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