Question

what is the unit of refractive index ?

Answer 1

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• refractive index have no SI units, since from the definition refractive index is the ratio of velocity of light in a material divided with velocity of light in vacuum.

@MissValiant❤࿐

Answer 2

Unit of refractive index (μ) will be the ratio of the unit of speed of light in vacuum(c) to the speed of light in the given medium(v). As you can see, the unit of refractive is 1, which means the refractive index is just a number without any unit.