Question

What is the unit of refractive index ?​

Answer 1

Answer:

Refractive index has no units because the refractive index is the ***ratio*** of the speed of light within the material of interest divided by the speed of light in a vacuum, thus the consistent units of measure (meters per second, or kilometers per second, etc.)

Answer 2

Refractive index of a medium is defined as the ratio of free space velocity of light(c) to the velocity of the light in that medium(v). So, refractive index(n)=c/v. As it is a ratio of same physical quantity(velocity),it has no unit.

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