Q

The ratio of the speed of light in a medium to that in vacuum is called _____.

RRB NTPC (Stage-I) 22/04/2016 / Shift-I 2016
✓ Answer: B Refractive index
Source key B is retained, but the ratio in the question is reversed. Absolute refractive index is speed in vacuum divided by speed in the medium, c/v.
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