Show that when a wave is incident at the Brewster angle, Eq. (4.95), then the transmitted wave travels at an angle ϑ t = π/2 − ϑ i . Hence, show that it is impossible to find two media such that the...

Show that when a wave is incident at the Brewster angle, Eq. (4.95), then the transmitted wave travels at an angle ϑ_t
= π/2 − ϑ_i. Hence, show that it is impossible to find two media such that the Brewster angle at their interface equals π/4.