Question

formula for refractive index

Answer 1

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n=c/v

Where, n = index of refraction
c = velocity of light in vacuum
v = velocity of light in medium

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Answer 2

absolute refractive index is defined as a ratio of the speed of light in the vacuum and in selected medium  

relative refractive index is defined as a ratio of speed of light in two different media

When in relative refrective index ,second medium is vacuum then both will be same

Formula n=c/v