After the procedure, your cornea should bend (refract) light rays to focus more precisely on your retina rather than at some point beyond or short of your retina.

完成手术程序后的角膜可以使光线更精确的发生折射，形成的焦点位于视网膜上，而不是超过或者达不到视网膜。

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This is because, with a broad source, light rays hit your subject from more directions, which tends to fill in shadows and give more even illumination to the scene.

这是因为光源越广，射在物体上光线的方向就越多，这会起到增加场景中的照明、减少阴影的作用。

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When you are short-sighted, your eyes focus well only on close objects, while more distant objects appear blurred. This is because light rays focus in front of the retina.

近视是指一个人对近距离的物体比较容易看清而远处的物体看不清楚的现象，它的产生是由于光线的聚焦点落在了视网膜之前。

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Sometimes we model light as beams of light, as rays of light.

有时候我们把光看成光束模型，看成光射线。

麻省理工公开课 - 固态化学导论课程节选

So you know that x-rays are higher frequency than UV light, for example, that means it's also higher energy than UV light, and if you think back to our photoelectric effect experiments, do you remember what type of light we were usually using for those? Does anyone remember?

你们知道，X，射线的频率比紫外光高，这意味着，它的能量也比紫外光要高，那么，请大家回想一下我们的光电效应实验，大家还记得当时我们用的是什么光源吗？,有人记得吗？

麻省理工公开课 - 化学原理课程节选

Because the metamaterial is imperfect, the light rays are distorted and interact with each other as they spread.

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This helps "recycle" any light rays which fail to travel the desired path.

BBC: LED streetlamp aims to improve public's view of stars

The near object's gravity bends the light rays from the more distant object and magnifies them like a lens.

BBC: Artist's concept of a distant world (BBC)