(a) When light rays travel through colloidal solution:
When light rays are allowed to pass through a true solution then this light does not seen in solution till the eyes have not close in the path of direction of light. But when light beam is passed through colloidal solution then this light is seen in the form of bright line. The phenomenon is called Tyndall effect.
(b) Electric current is passed through colloidal solution:
Electric current is passed through colloidal solution then the movement of colloidal particles observe towards oppositely charged electrodes in presence of electric field. This phenomenon is called electrophoresis.
