Question

Why was beam of light pass in colloid solution

Answer 1

$\Huge{\boxed{\red{\mathbb{ANSWER}}}}$

This is due to the $\bold{tyndall\:effect}.$ It happens due to the scattering of beam of light which passes through a colloid solution. The particles of colloid are dispersed in the liquid (solvent) and do not settle at the bottom.

When a beam of light is passing through the colloid solution it colloids (hits) with the micro-particles of the solution, as the size of the colloid particle is quite bigger than that of suspension and of solutions ranging from 1 - 1000 nanometres.

When light is passing through the water, it will not scatter it, 'cause it is not a colloid whose particles are quite bigger so that, it can hit to the particles.

Milk is a good example of colloid. When the light passes through the milk, it will pass the light rays as it a colloid whose particles are bigger enough to scatter it.

$\large{\bold{\underline{Thus,\:colloids\:are\:abled\:to\:scatter\:the\:light.}}}$