.55 A plane wave in free space (0) is incident normally on a large block of material with (e, 12, 1, 3, or 0) that occupies z 20. If the incident electric field is E-30 cos(out-z)a, V/m Find (a) as, (b) the standing wave ratio, (c) the reflected magnetic field, (d) the average power density of the transmitted wave.