forward scattering

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Scattering in which photons emerge from the scattering medium travelling predominantly in the same direction as they entered. Forward scattering and backscattering always occur together, but the proportion of forward scattering increases with particle size. The haloes around the Sun and Moon in wet weather are caused by forward scattering by water droplets in the Earth’s atmosphere.

Subjects: Astronomy and Astrophysics — Chemistry.

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