Abstract

The radiance <i>N</i>, resulting from an initially narrow collimated beam, propagating in the ocean, is investigated with the aid of the small-angle-scattering theory of electron scattering. The resulting expression for <i>N</i> is calculated approximately and compared both with experiments and numerical calculations. <i>V</i>arious properties of the approximate expression for <i>N</i> are explored; an observer, located off the axis of the beam at an axial distance z from the source, who attempts to determine the direction to the source by seeking the maximum of <i>N</i> with respect to ray direction, would sight a point on the beam axis at a distance <i>z</i>/3 from the source.

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