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Question

What is meant by Refractive index?

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Solution

The refractive index of the second medium with respect to the first medium is given by the ratio of the magnitude of the velocity of light in medium first to that in 2nd medium. It is represented by 1η2.
Refractive Index=Velocity of light in first mediumVelocity of light in second medium
i.e., 1η2=v1v2

and 2η1=v2v1.

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