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# What are the type of solution in the two tumblers below respectively ?

$(a)\;colloidal\; ;colloidal\qquad(b)\;true\; ;colloidal\qquad(c)\;colliodal\; ; true\qquad(d)\; true \; ; suspension$

Explanation :
When a strong beam of light is passed through a true solution placed in a beaker , in a dark room , the path of the light does not become visible .
However , if the light is passed through a sol , placed in the same room , the path of the light becomes , visible when viewed from a direction at right angle to that of the incident beam .
The phenomenon of scattering of light by colloidal particles as a result of which the path of the beam becomes visible is called tyndall effect .