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Question

The ratio $$\displaystyle \frac {speed\, of\, light\, in\, vacuum}{speed\, of\, light\, in\, a\, medium}$$ is called the .......... of this medium.

A

angle of incidence

B

refractive index

C

angle of dispersion

D

focus

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Solution

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Correct option is B. refractive index

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