A uniform plane wave, impinging at normal incidence on the plane (x1= 0) of separation between two lossless dielectric media, conveys a power density of 1 mW/mm2. The power density of the transmitted wave is 3 dB below that of the incident wave. Find the modulus of the electric field of the reflected wave in the following two cases:
a) the medium in which the incident and the reflected waves travel is air;
b) the medium in which the transmitted wave travels is air. Repeat the problem assuming that the incidence angle is π/4 and that the power densities on the x1= 0 plane remain the same as in the previous cases.
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