Fig. 2. Polarization arising from the reflection of light by a water surface. Unpolarized sunlight (left panel) becomes linearly polarized when it is reflected by water surfaces. The reflected light is horizontally polarized (right panel). Maximum polarization is reached at a particular angle of incidence (Brewster’s angle; 53° for the air/water interface). Background landscape: Sabkhat al Muh, south-east of Tadmur, Syria.