Mie scattering by spheres in an absorbing medium*

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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, Qext, can be less than the scattering-efficiency factor, Qs. In fact, Qext, 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.