Q13. an electromagnetic wave is incident on a water-air interface. the phase of the perpendicular component of the electric field, e, of the reflected wave into

Q13. An electromagnetic wave is incident on a water-air interface. The phase of the perpendicular component of the electric field, E, of the reflected wave into the water is found to remain the same for all angles of incidence. The phase of the magnetic field H (a) does not change (c) changes by z/2 (b changes by 3n/2 (d) changes by z