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The relation between the magnitudes of the incident, reflected and transmitted waves are obtained using Fresnel coefficients.

If a field moves from air to a more denser medium, which field should have a greater magnitude (reflected or transmitted)? I thought that it would be the reflected one but I found that the transmission coefficient is greater than the reflected one. So the transmitted wave magnitude is greater than the reflected one ? Am I making any sense? If what I said is true, how come is that possible?

If a field moves from air through a wall of concrete of thickness t, I calculated the transmitted field after the first boundary, but when I tried to calculate the transmitted field at the second boundary, I found out that the transmission coefficient is greater than 1? Is that possible????

Thanks in advance