Goddu, Robert F. Fibers and Film Research Division, Hercules, Inc., Wilmington, Delaware.
Little, James N. Research Division, Waters Associates, Milford, Massachusetts.
Last reviewed:January 2020
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A method of chemical analysis based on the measurement of the index of refraction of a substance. As shown in the illustration, when light impinges on the surface of a material at an angle i to the normal to the surface, its direction is changed on passing into the material so that it then travels at an angle r to the normal. The index of refraction is defined in the equation below.
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