Question

what is equation of relative refractive index?????

Answer 1

Then we can find the relative refractive index 1n2 by dividing the speed of light in material 1 (c1) by the speed of light in material 2 (c2) OR by dividing the refractive index of material 2 (n2) by the refractive index of material 1 (n1) OR by dividing the sine of the incident angle (q1) by the sine of the refracted 
hope this helps u frnd ♥️
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Answer 2

1n2=v1/v2
= 1n2= speed of light in medium1/speed of light in medium2