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现行高中物理甲种本第三册“球面镜”这节后面的练习第四题,多数同学的思考方法与某些教学参考书介绍的解题方法相同。只考虑到两凹镜焦点重合的一种情况,其光路图如图1,两凹镜的顶点P_1P_2间距离为2f。现补充另一种解法,即两凹镜焦点间距离为f。α光束平行主轴向右经右边凹镜反射后过其焦点F_2(也
The current fourth problem of the current high school physics category A “spherical mirror” is the same as the problem solving method introduced in some teaching reference books. Considering only one case in which the two concave mirrors coincide with each other, the optical path diagram thereof is as shown in Fig. 1, and the distance between the vertices P_1P_2 of the two concave mirrors is 2f. Another solution is added, that is, the distance between the focal points of the two concave mirrors is f. The α beam is parallel to the main axis and is reflected by the right concave mirror after passing through the focal point F_2 (also