Abstract
An exact law is derived for the propagation in free space of the first generalized radiance function introduced by Walther. A simplified form of this law is obtained for the case when the source is quasi-homogeneous. It is also shown that when the source is quasi-homogeneous and the wave number is large enough (the wavelength is sufficiently short) the first generalized radiance acquires all the properties of the radiance of traditional radiometry.

This publication has 11 references indexed in Scilit: