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。
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《 解答 》 |
在界面之上,光速是 ,在界面之下光速是 ,光自 出發,走向 ,
費馬最小時間要求
是最小值。對 微分要等於0
得到
其中 , 分別是入射角和折射角,這就是斯奈爾折射定律。
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