Define absolute refractive index?
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Absolute refractive index of a medium is defined as the ratio of the velocity of light in a vacuum to the velocity of light in the medium. If c is the velocity of light in vacuum and v in the medium, then: n=c/v.
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When the first medium is vacuum or air, then the speed of the light in the second medium with respect to the first medium is known as the absolute refractive index of the second medium.
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