what is refractive index
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The refractive index of a material is a dimensionless number that describes how fast light travels through the material.
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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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