Question

what is meant by refractive index and write its units​

Answer 1

Hii there

here is your answer

the ratio of the velocity of light in a vacuum to its velocity in a specified medium.

Hope it helped u

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Answer 2

Answer:

Refractive index of second medium with respect to first medium is defined as the ratio of sine of angle of incidence in first medium to sine of angle of refraction in second medium.

It has no units as it is the ratio of two similar quantities.