Prove the law of the latter The angles made with the plane of the interface are found from E.a, = |E|cos (90-0) 5=38 sin 0 0 = 54.2 E.az |E|cos (90-0) 2 =17 sin 0 0 = 29.0 A useful relation can be obtained from Ezt tan 0 = dent (Ey) (Ex1) + (Ey) port E2 (Ex2) + (Ey2) (Ex2) + (Ey2) tan 0 Erz == tan 8 fri tan 0 = by division of these two equations gives 11