what is refractive index?
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In optics, 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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Refractive index is the measure of how much light slows down when it goes into a new medium
symbols of refractive index=n
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