. Tyndall effect is observed only when


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

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

(iii) the size of the particles is generally between 10-11 and 10-9 m in diameter.

(iv) the dispersed phase and dispersion medium can be seen separately in the system.

 

A: (i) and (iii)

B: (i) and (iv)

C: (ii) and (iii)

D: (i) and (ii)

 

Best Answer

Correct option is: (D) (i) and (ii)

Explanation:-

  • The scattering of light by a colloidal solution is known as tyndall effect due to this the path of light is visible in colloidal solution.
  • The wavelength of light and  diameter of dispersed particle should not differ greatly and the defective indexes of dispersed phase and dispersion medium must differ greatly in magnitude 

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