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Fermat's principle
noun
- 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.
Fermat's principle
noun
- 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
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Word History and Origins
Origin of Fermat's principle1
First recorded in 1885–90; named after P. de Fermat
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