Fermat's principle (费马原理)

  Fermat's principle states that "light travels between two points along the path that requires the least time,as compared to other nearby paths."


https://en.wikipedia.org/wiki/Fermat%27s_principle


光学 费马原理推出 反射定律和折射定律光学 费马原理推出 反射定律和折射定律

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