What is Refractive index?
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Explanation:
the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as n={\frac {c}{v}}, where c is the speed of light in vacuum and v is the phase velocity of light in the 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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