First, on the basis of the polarization of waves, an elliptical polarized incident wave is decomposed into two rectilinear ones that intersect vertically; then by matching different conditions of a plane interface, the result of their respective action on the interface is discussed and finally the two rectilinear waves are composed again. After all this, the rules of the polarization of an elliptical polarized incident wave are concluded when it is incident to the interface vertically or at the Br...