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Chapter 1

Optical Properties: Light scattering

The scattering of visible light by dispersed systems is treated in terms of the three main theoretical systems: Rayleigh scattering for particles smaller than 50 to 75 nm; Mie scattering for particles comparable in size with the wave length of visible light (400 to 700 nm); and Fraunhofer diffraction for particles much larger than the wave length of visible light. Each theory has in turn to account for phenomena of scattering not envisaged by its predecessor. Quasi-elastic light scattering and laser velocimetry are also described.

Key Words: diffraction, Fraunhofer diffraction, laser velocimetry, light scattering, Mie scattering, quasi-elastic scattering, Rayleigh scattering, turbidity, Tyndall effect

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