Translations:Fermat’s principle and reflection and refraction/39/en

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Fermat’s principle states that a raypath between two points separated by several media of different velocities is a path such that the traveltime is stationary to the first order of differentials with respect to all conceivable neighboring paths. Huygens’ principle can be used to derive the law of reflection and Snell’s law of refraction. These same laws also can be derived by using Fermat’s principle, as we have done in this section.