Question

how does tyndall effect works in a colloid

Answer 1

Tyndall Effect:-

When light is passed through a true solution, the dissolved particles are too small to deflect the light.  However, the dispersed particles of a colloid, being larger, do deflect light.  The Tyndall effect is the scattering of visible light by colloidal particles.  You have undoubtedly “seen” a light beam as it passes through fog, smoke, or a scattering of dust particles suspended in air.  All three are examples of colloids.  Suspensions may scatter light, but if the number of suspended particles is sufficiently large, the suspension may simply be opaque and the light scattering will not occur.

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Answer 2

The Tyndall effect is the scattering of light as a light beam passes through a colloid. The individual suspension particles scatter and reflect light, making the beam visible. The amount of scattering depends on the frequency of the light and density of the particles.