全国统编初中物理课本(人民教育出版社,1979年第一版)第二册217页,有如下一段叙述:“在六十年代,曾经做了一个由三块平面镜组成的反射器,放到了月球上。这三块平面镜像室内墙角处那样,彼此相交成直角,能把任何方向射来的光线逆着原方向反射回去。……”现就一般的入射光线的反射情况进行讨论。图一中画出了反射器,它由相互垂直的 The 217 pages of the second book of junior high school textbooks for physics (People’s Education Press, 1979, first edition) were edited as follows: “In the 1960s, a reflector consisting of three plane mirrors was put into place. On the moon, these three planes mirror the inner corners of the room, intersecting each other at right angles, and reflecting the light from any direction back in the original direction...." The general reflection of incident light is now discussed. Figure 1 shows the reflector, which is perpendicular to each other