explain the term"absolute refractive index " of a medium and write an expression to relate it with the speed of light in vacuum ...
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It means the light passes through vaccum
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It is the refractive index of the medium defined with respect to a vacuum. It is the ratio of the speed of light in a vacuum to the speed of light in the medium. If the index is defined relative to another medium, the value for the refractive index is called a relative refractive index
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