Which of the following is not the condition for Tyndall effect? (a) The refractive indices of di...

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Which of the following is not the condition for Tyndall effect?
(a) The refractive indices of dispersed phase and dispersion medium should differ greatly in magnitude.
(b) The diameter of the dispersed particles is not much smaller than the wavelength of light used.
(c) Tyndall effect is observed only when viewed from the direction of the passage of light.
(d) All of these are required conditions for Tyndall effect.
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