The Tyndall effect is the scattering of light by particles in a colloid or in very fine suspensions. This phenomenon occurs when light passes through a medium containing small particles that are larger than molecules but smaller than what can be seen with the naked eye, typically ranging from about 1 nm to 1 µm in size. When a beam of light strikes these particles, it is scattered in various directions, which can make the path of the light beam visible.
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