目前大多数激光器是用硅来做反射镜，来来回回地反射激光X射线，但硅反射镜不能反射功率大的X射线。
Most lasers use silicon mirrors to bounce light wavelengths back and forth, but silicon can't reflect powerful X-rays.
牛顿望远镜和反射折射望远镜都有一个次级反射镜(或称斜反射镜)，它们阻挡了一部分主反射镜的发射光。
Newtonian and catadioptric telescopes have secondary (or diagonal) mirrors that obstruct a small percentage of light from the primary mirror.
对于平面镜这肯定是对的，但是对于其它形状的反射镜则情况只是近似如此。
This is certainly true for a plane mirror but it is only approximately the case for other configurations.
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