define refractive index of the medium
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In optics, the refractive index or index of refraction of a material is a dimensionless number that describes how fast light propagates through the material. It is defined as. where c is the speed of light in vacuum and v is the phase velocity of light in the medium
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The refractive index of a medium is the ratio of speed of light in vacuum to that of speed of light in medium.
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