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Fermat's principle

noun
1.
Optics. the law that the path taken by a ray of light in going from one point to another point will be the path that requires the least time.
Origin
1885-1890
1885-90; named after P. de Fermat
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Fermat's principle

Fermat's principle

noun
1.
(physics) the principle that a ray of light passes from one point to another in such a way that the time taken is a minimum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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