what is tyndall effect class 9

The Tyndall effect is the phenomenon in which the particles in a colloid or a very fine suspension scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions and some very fine suspensions. It is named after the 19th-century physicist John Tyndall, who was the first to describe the effect. The scattering of light by the particles in the air can provide information about the size and concentration of pollutants in the air. An example of the Tyndall effect is when a torch is switched on in a foggy atmosphere, making the path of the light visible due to the scattering of light by water droplets in the fog