The refractive index of a medium is the ratio of:

ASpeed of light in medium to speed in vacuum

BSpeed of light in vacuum to speed in medium

CWavelength in vacuum to frequency

DFrequency in medium to speed in vacuum

Answer

Speed of light in vacuum to speed in medium

Refractive index n = c/v, where c is speed in vacuum and v is speed in medium.

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The refractive index of a medium is the ratio of:

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