Light, ContinuedPolarizationPolarized light vibrates in only one direction. Ordinarily, light rays vibratein all directions at right angles to their direction of travel. When light wavesstrike a series of parallel microscopic slots, all the light that passes throughvibrate in one direction. Filters that polarize light have practical use inphotography and in simulating motion on overhead projecturals. Specularlight reflected from nonmetallic surfaces at any angle between 32° and 37°,is polarized in such a manner that the light rays vibrate in a direction parallelto the reflecting surface. Light reflected in this manner is said to be planepolarized and is seen as glare.Figure 2-6 shows plane polarization or the characteristics of glare.LIGHTSOURCEFigure 2-6.—Plane polarization or glare.2-8
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