Question

when a beam of light is passed through the solution of substance a dissolved in water, the path of light could be seen. what is this phenomenon called?what is the nature of tis solution?

Answer 1

Such phenomena is known as $\textbf{tyndall effect }$

Such solutions have solute particles which can't pass through the filter paper.

Answer 2

☺️hey mate! here's your answer!☺️

" $\textbf{ Tyndall effect }$ "

when a beam of light passed through the solution of substance a dissolved in water, the path of light could be seen.

so, the nature of solution is " $\textbf{ COLLOIDAL }$ "

FOR EXAMPLE :-

if you dissolve few drops of ink in water, the path of light could be seen easily , thus , it is a COLLOIDAL solution.

hope it is helpful ✌️!