Field and Wave Electromagnetics 2nd Edition by David Cheng

Exercise 67

An electromagnetic wave from an underwater source with perpendicular polarization is incident on a water-air interface at i = 20°. Using r = 81 and r = 1 for fresh water, find (a) critical angle c , (b) reflection coefficient , (c) transmission coefficient , and (d) attenuation in dB for each wavelength into the air.