# TIA's Glossary of Telecommunication Terms

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## Lambert's cosine law

The mathematical statement that the radiance of certain idealized optical sources is directly proportional to the cosine of the angle--with respect to the direction of maximum radiance--from which the source is viewed. *Note:* Lambert's cosine law may also apply to certain idealized diffuse reflectors. *Synonyms* cosine emission law, Lambert's emission law.

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