Why copper sulphate solution in water doesnot show tyndall effect but water and milk mixture shows tyndall effect

Dear Student,

Copper sulphate solution does not show tyndall effect as copper sulphate solution in water is homogenous solution. Tyndall effect is the phenomenon of scattering of light by the particles of colloid or suspension because of which the path of light is illuminated. The tiny particles scatter the beam of light and make its path visible. 

Milk is a colloid. Hence, a mixture of milk and water will show tyndall effect. 

Regards