Question

define refractive index

Answer 1

hey frnds.......

The ratio of the velocity of light in a vacuum to its velocity in a specified 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