Question

what is refractive index?

Answer 1

Answer:

The ratio between the speed of light in medium to speed in a vacuum is the refractive index. When light travels in medium other than the vacuum, the atoms of that medium continually absorb and re-emit the particles of light, slowing down the speed light.

Explanation:

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Answer 2

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