Answer this ASAP

Dear student,
Relative refractive index: When the light goes from one medium ( other than vacuum or air) to another medium then that refractive index is called relative refractive index
The relative refractive index of medium 2 with respect to medium 1 is the ratio of the speed of light in medium 1 to that in medium 2.  i.e., μ 21 = v 1 /v 2 .
Option c is correct.

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