What is refractive index!
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Explanation:
the extent of the change in direction that takes place in a given pair of media is called Refractive index
or
the ratio of angle of incidence to the angle of refraction is equal to the constant . This constant is called the refractive index of the second medium to the first medium
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Answer:
The ratio of the velocity of light in a vacuum to its velocity in a specified medium.
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