Abstract
The Hamilton-like equations of geometrical optics determine the
rays
of the relevant wavefield in the short wavelength limit. It is shown that, by appending a set of subsidiary equations, the associate
intensity
can be computed along each ray, as the ray itself is traced. The analysis is applicable to any form of wave propagation, and is not confined to optics. It extends to a fully dispersive anisotropic system, some work of P. Ugincius
J. acoust. Soc. Am.
45, 193-205, 206-209 (1969) on acoustic propagation (which is not dispersive) in inhomogeneous media.
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