what are relative and absolute refractive index explain properly.
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Absolute refractive index is the refractive index of a medium in vacuum. More specifically, it is the ratio of the spped of light in vacuum to the speed of light in that medium. It is always greater than one
The ratio of the speed of light in a vacuum to the speed of monochromatic light in the substance of interest. Also called the absolute index of refraction it is commonly called the refractive index or index of refraction. ... That ratio should be called a relative refractive index.
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