For the angle of incidence satisfying equation (8), the reflected light is purely s polarized. This particular angle of incidence denoted by is termed as the Brewster angle and from equation (8) it can be easily shown .                  

                 ................................................(10)

In case if the first medium happen to be other than air than than equation (10) can be shown to be modified as

                             

Thus if an electromagnetic wave falls at an Brewster's angle then the reflected light is S polorized. Hence this is one of the way to generate the polorized light.