Question

define absolute refractive index of the medium ​

Answer 1

The refractive index of a medium is also defined with respect to air.This is known as absolute refractive index.

Absolute refractive index=velocity of light in air(c)/velocity of light in medium(v).

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Answer 2

Absolute refractive index of a medium is considered as the refractive index of medium one with respect to air. the refractive index of a medium is given by

$ng = \frac{speed \: of \: light \: in \: air}{speed \: of \: light \: in \: the \: medium} = \frac{c}{v}$


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