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The Tyndall effect is observed only when following conditions are satisfied :- [JEE Main 2017] [a] The diameter of the dispersed particles is much smaller than the wavelength of the ligh used. [b] The diameter of the dispersed particle is not much smaller than the wavelength of the light used. [c] The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude. [d] The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.     JEE Main Solved Paper-2017

A)  [a] and [d]                         

B)  [b] and [d]

C)  [a] and [c]                         

D)  [b] and [c]