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{{Distinguish|Rayleigh scattering}}
[[File:SonneNebel.jpg|thumb|Tyndall effect in misty forest]]
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Under the Tyndall effect, the longer wavelengths are [[Transmittance|transmitted]] more while the shorter wavelengths are more [[diffuse reflection|diffusely reflected]] via [[scattering]].<ref name=":1" /> The Tyndall effect is seen when light-scattering [[particulates|particulate matter]] is dispersed in an otherwise light-transmitting medium, where the [[particle size|diameter]] of an individual [[particle]] is in the range of roughly 40 to 900 [[nanometre|nm]], i.e. somewhat below or near the wavelengths of [[visible spectrum|visible light]] (400–750 nm).
It is particularly applicable to colloidal mixtures and fine suspensions; for example, the Tyndall effect is used in [[nephelometer]]s to determine the size and density of particles in [[aerosols]]<ref name=":1" /> and other colloidal matter. Investigation of the phenomenon led directly to invention of the [[ultramicroscope]] and [[turbidimetry]].
It is named after the 19th-century physicist [[John Tyndall]], who first studied the phenomenon extensively.<ref name=":1" />
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