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The Tyndall effect is observed only when following conditions are satisfied :
(i) The diameter of the dispersed particles is much smaller than the wavelength of the light used.
(ii) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
(iii) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude.
(iv) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

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(i) and (iii)

(ii) and (iv)

(ii) and (iii)

(i) and (iv)

answer is B.

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Detailed Solution

(ii) The diameter of the dispersed particle is not much smaller than the wavelength of the light used.
(iv) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.

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