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2. Regarding the polarization of a plane wave: (30%
(c) A plane wave at a wavelength of 1000 nm is linearly polarized at an angle o with respect to the x-axis in air and propagates along the z-direction, as shown below. A dielectric with thickness L is placed in the path of wave propagation, which is characterized with a refractive index of 1.55 along the x-axis and a refractive index of 1.54 along the y-axis. Note that the propagation constant k = wn/c in a lossless medium, where n is the refractive index and c is the speed of light.
(i) If the plane wave becomes circularly polarized after passing through the dielectric, determine the angle 0 and the thickness L. (ii) If the plane wave is still linearly polarized after passing through the dielectric but with its polarization direction perpendicular to that of the incident wave, the angle 8 and the thickness L. dielectric X le=? 0 E Z Y K L=?