Velocity of electromagnetic waves in a medium depends upon

Velocity of electromagnetic waves in vacuum depends upon

Velocity of electromagnetic waves in a medium is ..

Write down the expression for the velocity of electromagnetic wave in a medium and hence find out an expression for the refractive index of the medium.

Write down the expression for the velocity of electromagnetic wave in a medium and heance find out an expression for the refractive index of the medium.

How is the velocity of an electromagnetic wave in a medium related with the electric and the magnetic properties of that medium?

Calculate the velocity of electromagnetic waves in a medium having mu_r 2.5 and in_r = 1.6