Define the term refractive index of a medium Can it be less than 1 - Physics - Refraction of Light

Question

Define the term refractive index of a medium Can it be less than 1

MD Ashhar Uddin · Accepted Answer

Dear student

Refractive index is the ratio of speed of light in vacuum to speed
of light in a medium
Refractive index can never be less than 1 because speed of light is
maximum in vacuum i e 3*108m/s

Hope it helps

Define the term refractive index of a medium.Can it be less than 1