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(A) When a beam of light is passed through a colloidal solution and observed under an ultramicroscope,the colloidal particles appear as bright spots o

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Light scattered by colloidal particles

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(A) When a beam of light is passed through a colloidal solution and observed under an ultramicroscope,the colloidal particles appear as bright spots of light against a dark background. This is due to the scattering of light by the colloidal particles,a phenomenon known as the $Tyndall$ effect. The ultramicroscope does not show the actual size or shape of the particles,but rather the light scattered by them.

When a colloidal solution is observed under an ultramicroscope,we can see ..........

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