Question

Can absolute refractive index of a medium be less than unity?​

Answer 1

The absolute refractive index of a medium is the ratio of speed of light in vacuum to the speed of light in the medium . In this scenario , the numerator will always be greater than the denominator . Thus , absolute refractive index can never be less than one .

Answer 2

hey mate here is ur ans.

Any medium having a refractive index below 1 would violate something which has that often be proven that we can quite savely assume it is a nature of law. Thus, asoluterefractive index of a medium cannot be less than unity.

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