# Brewster's Angle

In the explanation of Brewster window, wherever in the literature I have looked up, it considers the unpolarized light with only two polarization components: the s and p components.

But, in case of unpolarized light, the electric field oscillates in all directions, so at Brewster angle the p polarized light will not be reflected, I understand. But what about the other electric field components, other than s one? I suppose they will be reflected too. If this is the case, how does it come that the reflected light is completely polarised?

Thanks!