Question

The tyndall effect is observed only when following conditions are satisfied
1) The diameter of the dispersed particles is much smaller than the wavelength of light is used
2) The diameter of the dispersed particles is not much smaller than the wavelength of the light used
3) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude
4) The refractive indices of the dispersed phase and dispersion medium after greatly in magnitude. ​

Answer 1

Answer:-

Tyndall Effect:

★The Tyndall effect is scattering of light by particles in a colloid or particles in a fine suspension.

★It can be seen when the light passes through the colloids or turbid substances causing the light to scatter in multiple directions.

Examples are: Fog because it is a colloidal substance

according to above statement, the correct ✔is,

• The diameter of the colloids should not be much smaller than the wavelength of light used.
• The refractive indices of the dispersed phase and dispersion medium should differ greatly in magnitude.

Answer 2

Answer:

2 and 4 are correct.

2) The diameter of the dispersed particles is not much smaller than the wavelength of the light used.

4) The refractive indices of the dispersed phase and dispersion medium after greatly in magnitude.

EXPLAINATION:

• tyndall effect is the scattering of light by the particles.

• When the beam of light passes through the particles , they scatter the light

• If the dispersed particles diameter are smaller than lambda of light they won't be able to scatter light.

• Scattering of light happens when the colloidal particles diameter are not smaller or are of same size that of lamda of light. This proves 2nd option to be correct.

• The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude is not possible universally.

• Also the refractive indices of dispersed phase and dispersed medium should greatly differ in magnitude or else the light passes through and no tyndall effect happens. which proves 4th option to be correct.