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1999年全国初中物理竞赛初赛(初三组)有一道有趣的光学试题.其题目为:两个平面镜互成60°,如图1所示.两镜前有一发光点 S,它能成几个像?请在图中把它们画出来?这是一道组合平面镜成像的问题.由于射向组合平面镜的光线往往要在平面镜之间发生多次反射,因而会出现生成复像的现象.成像的个数不但取决于两平面镜夹角的大小,还取决于物点的位置.这是一个较复杂的问题,
In the 1999 National junior high school physics competition preliminary competition (3rd grade group), there was an interesting optical test. Its title was: The two plane mirrors were 60° to each other, as shown in Fig. 1. There is a luminous point S in front of the two mirrors. It can become several images. Please draw them out in the diagram. This is a problem of combined planar mirror imaging. Since the rays of light directed at the combined plane mirror often have multiple reflections between the plane mirrors, the phenomenon of generation of complex images occurs. The number of images Not only depends on the size of the angle between the two plane mirrors, but also on the position of the object point. This is a more complex issue.