The Tyndall effect is the phenomenon that occurs when particles in a colloid scatter light beams directed at them. All colloidal solutions and some very fine suspensions exhibit this effect. As a result, it can be used to determine whether a given solution is a colloid.

The intensity of scattered light is affected by the density of colloidal particles as well as the frequency of incident light.

When a light beam passes through a colloid, the colloidal particles in the solution prevent the beam from passing completely through. Light is scattered when it collides with colloidal particles. This scattering reveals the path of the light beam, as shown below.
#tyndalleffect

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