They think that a stick refracted in the water is therefore a crooked stick.

诗人甚至不能理解折射，还认为从水面上看,水中的木棍儿显得弯曲是因为它就是弯的呢。

耶鲁公开课 - 文学理论导论课程节选

And then he just takes that narrow column of light and he admits it to a prism. And what the prism does is takes a tiny, tiny difference in wavelength and refracts it through a different angle.

他只取了那个窄光柱,然后把它对准一个棱镜，棱镜所做的就是,测量出波长的细微差别,然后从不同的角度测定它的折射度。

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