define refractive index
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Refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another .
Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v.
Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v.
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In simple it is the ratio of the velocity of light in a vacuum to its velocity in a specified medium
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