In telecommunication, a conservation of radiance is a basic principle of optics, that no passive optical system can increase the quantity L /n2, 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."
... Church of France[?]
In France, the Reformed protestants were called Huguenots. The Reformed Church of France survived under persecution from 1559 until the Edict of ...