When a strong beam of light is passed through milk, the path of light becomes visible. What is this phenomenon called?

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Solution

Milk is a colloid, particularly emulsion, where the dispersed phase and dispersion medium is liquid.
The particles which are dispersed in the medium is called dispersed phase and the medium in which the particlees are dispersed is called dispersion medium
When light is passed through a colloid, path of light becomes visible due to scattering by colloidal particles, this phenomenon is called Tyndall effect
Thus, when a strong beam of light is passed through milk, the path of light becomes visible and this phenomenon is called Tyndall effect
Particles which are having 1-1000 nm size scatter the beam of light, due to which path of light become visible

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