The speed of light in a medium of refractive index n is. _ where c is the light
is the speed of light in vacuum
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"n = c / v" "c" is the speed of light in a vacuum, "v" is the speed of light in that substance and "n" is the index of refraction. According to the formula, the index of refraction is the relation between the speed of light in a vacuum and the speed of light in a substance
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