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.

© 1987 Optical Society of America

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