The tyndall effect in colloidal solutions is due to

Homogeneous solution(placed in dark):   (i)Appears clear in the direction of light                                                             (ii)Appears perfectly dark at right angles to the direction of light.Colloidal sol (placed in dark): (i) Reasonably clear (or)Translucent in the direction of light                                            (ii) mild to strong opalescence at right angles to the direction of lightThis mild to strog opalescence observed in a colloidal sol is called Tyndal efect,It is due to scattering of light