Question

State the factors on which the relative refractive index of pair of media depends.

Answer 1

    Suppose a light ray travels from medium 1 to medium 2, then the relative refractive index of medium 2 with respect to medium 1 is useful.

Refractive refractive index of medium 2 with respect to the medium 1:
     = μ₂₁  =  μ₂  / μ₁

The factors on which it depends are:
   1.  Refractive index of medium 1:  μ₁.
         This depends on the material and the frequency of light ray.

   2.  Refractive index of medium 2:  μ₂.
         This also depends on the material and the frequency of light.

   3.  The frequency or wavelength or the color of the light/radiation used to measure the refractive index μ₂₁.

   4.  It depends on the direction of propagation of light rays from medium 1 to medium 2 or the other way round.
  
 We have two relative refractive indices for a pair of media:  μ₁₂ and  μ₂₁.

    They are reciprocals of each other.

Answer 2

HEY MATE HERE IS YOUR ANSWER:-

Refractive index of second medium with respect to 1st medium is the ratio of velocity of light in 1st medium to the velocity of light in 2nd medium.

HOPE IT HELPS ☺️