Define the term refractive index of a medium in terms of velocity of light

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Solution

The Refractive index is defined as the ratio of the speed of light in a vacuum to its speed in a specific medium.
The Refractive index is a dimensionless quantity because it is the ratio of two similar quantities.
It is a number that indicates the number of times slower than a light wave would be in the material than it is in a vacuum.
Refractive index, represented by symbol n.
$n = c / ν$
$w h e r e n = R e f r a c t i v e i n d e x, c = V e l o c i t y o f l i g h t i n a v a c u u m (3 \times 10^{8} m / s) . v = V e l o c i t y o f l i g h t i n a s u b s \tan c e .$

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