Tyndal effect occurs when

Question

$\begin{array}{1 1} (a)\;\text{the size of the colloidal particle is relatively smaller than the solute particle of a true solution} \\ (b)\; \text{the size of the colloidal particle is relatively greater than the solute particle of a true solution} \\ (c)\; \text{the size of the colloidal particle is equal to the solute particle of a true solution} \\ (d)\; \text{the size of the colloidal particle is negligibly small} \end{array}$