n :  the luminous path formed in the Tyndall effect by the breaking up of the entering light by the suspended particles - called also Tyndall cone 
 
Tyndall, John (1820-1893), British physicist. Tyndall was appointed professor of natural philosophy at the Royal Institution in London. He studied the diffusion of light by large molecules and dust. Basing his experiments on the fact that blue light more than any other light color tends to scatter, he demonstrated that the sky's blue color results from the scattering of the sun's rays by dust.
 
 
 
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