会聚透镜使光线会聚于一点，即焦点。
A convex lens causes rays to converge on a single point, the focal point.
会聚透镜使光线会聚于一点，即焦点。
凸透镜中心部分比周围要厚，它使光线会聚。
A convex lens is thicker at its center than its periphery. It causes rays to converge.
即使是在传感方向上发生一个微小的变化，例如光强，都可以通过观察这两条光线会聚时的相互作用的方式以及产生图案的不同，检测出来。
Even a tiny change to the light in the sensing path—suchas its intensity—can be detected by observing how the light from the two pathsinteracts when they meet, producing distinct patterns.
此时，光线显然不会聚。
这样的管道会聚集沿着自身跳跃的光线；于是当管道朝向观看者之时，它们看起来就是光球的样子。
These tubes focus light bouncing down the tube such that they appear as light orbs when the tube is turned toward the viewer.
这样的管道会聚集沿着自身跳跃的光线；于是当管道朝向观看者之时，它们看起来就是光球的样子。
These tubes focus light bouncing down the tube such that they appear as light orbs when the tube is turned toward the viewer.
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