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I) Diameter of the dispersed particles is not much smaller than the wavelength of light used
II) Diameter of the dispersed particles is much smaller than the wavelength of light used
III) Refractive indices of the dispersed phase and the dispersion medium must not differ much in magnitude
IV)Refractive indices of the dispersed phase and the dispersion differ greatly in their magnitude
Correct conditions to observe tyndall effect are

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I & II

I & III

I & IV

II & III

answer is C.

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Detailed Solution

1) size of DP not much smaller than $' λ'$ of light
2) Very small difference in refractive index

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