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2015-09-03T12:51:27+05:30

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It is the ratio between the velocity of the light in vacuum to the velocity of light in the specific medium.
It has no unit as it is the ratio.
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2015-09-03T13:13:18+05:30
The Refractive index of a medium is the ratio of the speed of the light in vacuum to the speed of light in the medium.  and  refractive index it has no units.
 


hope its help u.
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