Encyclopedia > Conservation of radiance

Article Content

Conservation of radiance

In telecommunication, a conservation of radiance is a basic principle of optics, that no passive optical system can increase the quantity L /n ², where L is the radiance[?] of a beam and n is the local refractive index.

Note: "Conservation of radiance" was formerly called "conservation of brightness" or the "brightness theorem."

Source: from Federal Standard 1037C and from MIL-STD-188

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

French resistance

... (see below). Franc-Tireur[?] Left-wing group formed by Jean-Pierre Lévy[?] in Lyon in 1941. In December 1941 they began to publish Le Franc-Tireur underground ...