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範例 27:斯奈爾折射定律
你知道什麼是「斯奈爾折射定律」嗎?接下來為你說明以費馬最小時間原理決定斯奈爾折射定律。
《 解答 》
width=300

在界面之上,光速是width="15",在界面之下光速是width="15",光自width=38出發,走向width="53"
費馬最小時間要求


是最小值。對width="15"微分要等於0


得到


其中 width="15"width="15"分別是入射角和折射角,這就是斯奈爾折射定律。



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