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Lambert's law

noun, Optics.
1.
the law that the luminous intensity of a perfectly diffusing surface in any direction is proportional to the cosine of the angle between that direction and the normal to the surface, for which reason the surface will appear equally bright from all directions.
Also called cosine law.
Origin
after J. H. Lambert
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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