Tyndall effect is scattering of a beam of light by a medium containing small suspended particles—e.g., smoke or dust in a room
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Spreading of light through a collidal solution

Scattering of light by dust particles or any other particles is called Tyndall effectIn forests when sunlight fallon canopy of trees and falls on the ground then we r able to see dust particles in the path of sunlight
The scattering of light by particles in its path is called Tyndall effect. When a beam of light enters a smoke-filled dark room through a small hole, then its path becomes visible to us. The tiny dust particles present in the air of room scatter the beam of light all around the room. Thus, scattering of light makes the particles visible. Tyndall effect can also be observed when sunlight passes through a canopy of a dense forest. Here, tiny water droplets in the mist scatter light.
It is seen maximum in milk
Tyndall effect is scattering of a beam of light by a medium containing small scattering of a beam of light by a medium containing small suspended particles—e.g., smoke or dust in a room, which makes visible a light beam entering a window.