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Lambert's law

noun, Optics.
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 of Lambert's law
after J. H. Lambert Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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