What is the formula for refractive index?

n = $\frac{S p e e d o f l i g h t i n v a c u u m}{S p e e d o f l i g h t i n t h e m e d i u m}$

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n =

\frac{S p e e d o f l i g h t i n t h e m e d i u m}{S p e e d o f l i g h t i n v a c u u m}

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n =

\frac{S p e e d o f l i g h t i n t h e v a c u u m}{S p e e d o f l i g h t i n v a c u u m}

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None of these

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Solution

The correct option is A
n = $\frac{S p e e d o f l i g h t i n v a c u u m}{S p e e d o f l i g h t i n t h e m e d i u m}$

Refractive index is defined as, n = $\frac{S p e e d o f l i g h t i n v a c u u m}{S p e e d o f l i g h t i n t h e m e d i u m}$ where, n is the refractive index of the medium. Speed of light in vacuum = 3 $\times 10^{8}$ m/s.

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