Only occurring when the objects present are between 10 to 2000 angstroms across, the affected light is polarized at right angles.  
It is the acting principle behind the function of an ultra-microscope, and it is also used to identify a specific path of light that is known as its namesake cone.  Only occurring when the objects present are between 10 to 2000 angstroms across, the affected light is polarized at right angles.  It offers an explanation for why car headlight beams can be seen in fog but are invisible in clear air, and its discoverer formulated it to explain the sky's blue color.  FTP, give the name for this scattering of light by colloidal particles, an effect named for the Englishman who discovered it.
It is the acting principle behind the function of an ultra-microscope, and it is also used to identify a specific path of light that is known as its namesake cone.  
Tyndall effect