How to find the refractive index of medium 1 with respect to medium 2 if the refractive indexes of both the mediums are given ? Do we divide the refractive index of medium 1 to the refractive index of medium 2 to get the refractive index of medium 1 with respect to medium 2 ? Share with your friends Share 1 Vipra Mishra answered this Dear Student Place medium 1’s refractive index in numerator, place medium 2’s refractive index in the denominator and then divide. Quotient is the refractive index of medium 1 with respect to medium 2.SoIf μ1 is refractive index of medium 1If μ2 is refractive index of medium 2 refractive index of medium 1 with respect to medium 2 =μ1μ2 Regards 1 View Full Answer