(a) If light is incident at an angle from a medium of index n1 on a medium of index n2 so that the angle

(a) If light is incident at an angle θ from a medium of index n1 on a medium of index n2 so that the angle between the reflected ray and refracted ray is β, show thatsin(A + B) = sin A cos B + cos A sin B(b) Show that the foregoing equation for tan θ reduces to Brewster??s law when β = 90?, n1 = 1, and n2 =n.

ng sin B tan e = ni - n2 cos B