Tyndall effect is observed when :

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Question:
Tyndall effect is observed when :

The diameter of dispersed particles is much larger than the wavelength of light used.
The diameter of dispersed particles is much smaller than the wavelength of light used.
The refractive index of dispersed phase is greater than that of the dispersion medium.
The diameter of dispersed particles is similar to the wavelength of light used.

Correct Option: , 4

Solution:

Tyndall effect is observed only when the following two conditions are satisfied.

(i) The diameter of the dispersed particles is not much smaller than the wavelength of the light used.

(ii) The refractive indices of the dispersed phase and the dispersion medium differ greatly in magnitude.