If `epsi_(0)` and `mu_(0)` are respectively, the electric permittivity and the magnetic permeability
Channel: Doubtnut
Date: 2020-08-30

If `epsi_(0)` and `mu_(0)` are respectively, the electric permittivity and the magnetic permeability of free space, `epsi` and `mu` the corresponding quantities in a medium, the refractive index of the medium is