Abstract

Equations are developed for Mie scattering by spheres (particles, bubbles, or voids) embedded in an absorbing medium. Computations demonstrate that under certain conditions the extinction-efficiency factor, <i>Q</i><sub>ext</sub>, can be less than the scattering-efficiency factor, <i>Q</i><sub>s</sub>. In fact, <i>Q</i><sub>ext</sub>, as commonly defined, can be negative. Also, results are shown for the angular scattering distribution by a void, which indicate that the intensity of the backward-scattered light can be greater than the forward-scattered light.

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