what is refractive index
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refractive index is a constant term that is the ratio of speed of light in medium in which refracted ray travels to the medium in which incident ray travels.
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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 travels 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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