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题目:〈高中《物理》(甲种本)第三册第196页〉如图1所示,M_1和M_2是两个焦距相等的凹镜,其焦距为f。要想使平行于主轴的光线a能在M_1和M_2之间来回反射,两凹镜的顶点P_1和P_2应相距多远?在图中标出两凹镜的焦点F_1和F_2的位置,并画出光线a被两凹镜反射的光路图。此题到底有几个解?有人认为,只有三个解。分别如图2、图3、图4所示。笔者认为,此题较为复杂,符合题意的解很多。本文试从如下的思路出发,进行分析讨
Topic: (Volume A) Volume III Page 196 As shown in Figure 1, M_1 and M_2 are two concave mirrors with the same focal length, and their focal length is f. In order to make the light a parallel to the main axis reflect back and forth between M_1 and M_2, how far apart the vertices P_1 and P_2 of the two concave mirrors should be? In the figure, the positions of the focal points F_1 and F_2 of the two concave mirrors are marked and plotted. An optical path diagram where light a is reflected by two concave mirrors. There are several solutions to this problem? Some people think that there are only three solutions. Respectively shown in Figure 2, Figure 3, Figure 4. The author believes that this question is more complex and is consistent with the solution of the question. This article tries to proceed from the following ideas and conduct an analysis and discussion.