What is meant by refractive index?
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Refractive index means the speed of light reflected from any medium is called is its reflective index.
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Refractive index is the measure of bending of a light ray when passing from one medium to another. It can also be defined as the ratio of the velocity of a light ray in an empty space to the velocity of light in a substance .
n = c/v
where , n is the refractive index of the medium
c is the velocity of light in vacuum
v is the velocity of light in the medium
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