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polarized light

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polarized light

Light in which the electromagnetic vibrations take place in one particular plane. In ordinary (unpolarized) light, the electric fields vibrate in all planes perpendicular to the direction of propagation. After reflection from a polished surface or transmission through certain materials (such as Polaroid), the electric fields are confined to one direction, and the light is said to be linearly polarized. In circularly polarized and elliptically polarized light, the electric fields are confined to one direction, but the direction rotates as the light propagates. Polarized light is used to test the strength of sugar solutions and to measure stresses in transparent materials.
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This property of light is exploited by polarized sunglasses, which block some of the polarized light to reduce glare on sunny days.
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But with polarized light microscopes, you can distinctively see optical properties of both isotropic (usually liquids and gases) and anisotropic materials (about 90% of solids).
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Today, you hear kinds such as the stereo microscope and the polarized light microscope.
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