Question

why refractive index cannot be less thn 1

Answer 1

refractive index =
$\frac{speed \: of \: light \: in \: vacuum}{speed \: of \: light \: in \: medium}$
since light travels fastest in vacuum so refractive index will always be greater than 1.
because if a greater no. is divided by a smaller no. it will always be greater than one.
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Answer 2

The refractive index is speed of light in vacuum/speed of light in that medium.
Since speed of light in vacuum is the maximum and in no other medium , light travels in the same speed or greater speed.
Therefore the refractive index is always greater than 1.


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