define 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
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Refractive index also called index of refraction , measure of the bending of a ray of light when passing from one mefium into another refractive index is aldo equal to the velocity of light C of a given wavelength in empty spacr divided by its velocity in a substance or, n = c/v
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