Abstract
An acoustic pulse emitted from a point source arrives on a well-defined wavefront after a fixed travel time. In the geometrical-acoustics approximation, this behavior is understood by following rays. Two simple ray models are presented to treat the scattering of rays by internal waves, and to evaluate the ratio of movements in the ray end points within and perpendicular to the wavefront. Assuming weak forward scattering, and no waveguide, the model predicts that the end points move along the wavefront over much larger distances than perpendicular to the wavefront. [Work supported by ONR.]
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