偏振光是横波的一种特性，本文介绍了布儒斯特角的基本概念。当入射光在特定角度下照射透明介质时，垂直极化的光将完全透过，而反射光则完全偏振。布儒斯特角可以通过折射定律和电磁波的反射系数来确定，通常在空气和玻璃间约为57°。虽然反射光完全偏振，但透射光的偏振效果较弱，需要多层偏振片堆叠才能增强。
Polarization is a property of transverse wave. Here we have some basics prepared for the Brewster's angle.
In the leftmost figure above, the two orthogonal (perpendicular) components are in phase. In this case the ratio of the strengths of the two components is constant, so the direction of the electric vector (the vector sum of these two components) is constant. Since the tip of the vector traces out a single line in the plane, this special case is called linear polarization. The direction of this line depends on the relative amplitudes of the two components.
In the middle figure, the two orthogonal components have exactly the same amplitude and are exactly ninety degrees out of phase. In this case one component is zero when the other component is at max
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