TS EAMCET Engineering 12 May 2023 Shift 2 Solved Paper

Consider the following about the Tyndall effect
I) It is used to distinguish between a true and colloidal solution
II) It is possible only when the dispersed medium and dispersed phase differ much in their refractive indices
III) It is observed only when the size of colloidal particles is much smaller than the wavelength of the light used
The correct statements are