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Fermat's principleThe principle that the path taken by a ray of light from one point to another is that which takes the minimum time (or the maximum time in select cases), named for its discoverer, French mathematician Pierre de Fermat (1601 to 1665). Snell's law and the laws of reflection and refraction follow from Fermat's principle. Fermat's princi [..]
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Fermat's principleIn its more or less original form, light travels between two points in the least possible time. More correctly, the path taken by a light ray between two points in an optically homogeneous media is su [..]
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Fermat's principleA principle stating that a ray of light follows the path that requires the least time to travel from one point to another, including reflections and refractions that may occur. Synonym least-time principle. [From Weik '89]
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