Define absolute and relative refractive index of any medium.
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Relative refractive index: The refractive index of medium 2 with respect to medium 1 is given as the ratio of the speed of light in medium 1 to that of the speed of light in medium 2. Absolute refractive index: If medium 1 is vacuum or air, then the refractive index of medium 2 is considered with respect to vacuum
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