What do you observe when a fine beam of light enters a dark room through a small hole?

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Solution

Definition of Tyndall effect:
Tyndall effect is the phenomenon in which the particles in a colloid scatter the beams of light that are directed at them. This effect is exhibited by all colloidal solutions.
Observation:
The Tyndall effect can be observed when a fine beam of light enters a dark room through a small hole.
The dust particle in the room through light beam passes becomes visible.
This happens due to the scattering of light by the particles of dust and smoke in the air.

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