Define refractive index of a medium w.r.t. another medium.

Can relative refractive index of a medium w.r.t another be less than unity?

Define absolute refractive index.

Derive the relation between refractive index of the medium and critical angle.

Define dielectric Constant of a medium.

The refractive index of air w.r.t glass is 2//3 .The refractive index of diamond w.r.t. air is 12//5 .What is the refrative index of glass w.r.t. diamond?

The refractive index of air w.r.t. med 1 is 6//7 .The refractive index of med 2 w.r.t air is 7//3 .Then ,the refractive index of med 1 w.r.t med 2 will be