Question

The refractive index of 1 type of glass W.R.T air is 1.65 and that of water W.R.T air is 1.33.calculate refractive index of watre W.R.T glass​

Answer 1

Refractive index of medium 2 w.r.t. medium 1 is written as  n21 = speed of light in medium 1/ speed of light in medium 2 n21 = v1/v2 Refractive index of glass w.r.t. air nga = 1.65 = va/vg ⇒ vg = va/1.65 Refractive index of water w.r.t. air nwa = 1.33 = va/vw  ⇒ vw = va/1.33 Refractive index of water w.r.t. glass nwg = vg/vw = ( va/1.65)/(va/1.33)                                                                                = 1.33/1.65                                                                                 = 0.80