During the propagation of electromagnetic waves in a medium:

Velocity of electromagnetic waves in a medium is ..

In the propagation of electromagnetic waves the angle between the direction of propagation and plane of polarisation is

In the propagation of electromagnetic waves the angle between the direction of propagation and plane of polarization is

In the propagation of electromagnetic waves the angle between the direction of propagation and plane of polarisation is

In the propagation of electromagnetic waves the angle between the direction of propagation and plane of polarisation is

The direction of propagation of an electromagnetic wave is that of