Question

give scientific reason : absolute refractive index can never be less than one.​

Answer 1

Explanation:

absolute refractive index can never be less than one . As absolute refractive index is ratio of speed of light in vacuum to that in the given medium, we can say it is alwaysgreater than one. This is because light travels with the highest speed in vacuum.

Answer 2

$refractive \: index = \frac{c}{v} \\ where \\ c = speed \: of \: light \: in \: air \\ v = speed \: of \: light \: in \: any \: medium$

Speed of light in air is always greater than the speed of light in any other medium.

Therefore refractive index can never be less than 1.

Refractive index>1