Fermat’s principle states that a light ray refracted across different media will traverse the fastest path as the physics for Snell’s law. A geometric proof of Fermat’s principle will be demonstrated as an intuitive approach to learn high school geometry and physical optics. It will be proved explicitly by showing that all alternative paths need more traversal time to complete their journey.

中文翻译：

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费马原理的几何方法作为高中几何和物理光学的演示

费马原理指出，在不同介质上折射的光线将穿越最快的路径，作为斯涅尔定律的物理学。费马原理的几何证明将作为学习高中几何和物理光学的直观方法进行演示。将通过显示所有替代路径需要更多遍历时间来完成其旅程来明确证明。