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what happens when a beam of light is passed through a colloidal solution ?
Colloidal solutions are turbid ,heterogeneous mixtures in which particles that is a dispersed substance exist in an intermediate state between molecules or ions of a true solution and that of a suspension .
The particles of a colloidal solutions are not visible to the naked eye  and can pass through a filter paper but cannot diffuse through a semipermeable membrane .It can be seen under an ultra microscope and do not settle down .Light passing through a colloidal dispersion, such as smoky or foggy air, will be reflected by the larger particles and the light beam will be visible.


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