The scattering of light by dispersed colloidal particles or emulsion suspensions, named after the Irish scientist John Tyndall. The suspended particles reflect the light, making a beam of lighting passing through it more visible. This effect can be used to determine whether a colloid has large particles or not. The Tyndall effect is noticeable when car headlights are used in fog and the light beams are visible versus in clear weather the light beams are invisible. The finer or smaller the dispersed particles, the smaller the diameter cone of light beam scatter..