13 novembre 2010
There is no good reason why fog lights are yellow
There is no good reason why Fog Lights are yellow. Here is an
excellent explanation provided by Professor Craig Bohren of Penn State
University:
"First I'll give you the wrong explanation, which you can find here and
there. It goes something like this. As everyone knows, scattering (by
anything!) is always greater at the shortwavelength end of the visible
spectrum than at the longwavelength end. Lord Rayleigh showed this, didn't
he? Thus to obtain the greatest penentration of light through fog, you
should use the longest wavelength possible. Red is obviously unsuitable
because it is used for stop lights. So you compromise and use yellow
instead.
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