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题:一根尺 AB 上有对称的两只小孔 C、D,C、D 间距正好是某人两跟距离,现让尺 AB平行于一平面镜,该人用两眼通过 C、D 孔看镜中尺的像 A′B′,要看到完整的像A′B′,平面镜的宽度至少为多少?解析:根据平面镜成像与物体对称的特点,在图1中作出尺 AB 在平面镜中的虚像A′B′.人的左眼通过 C 孔观看镜中全像所需镜宽的范围为 MQ ( C与 A′的连线交平面镜于 M,C 与
Question: There are two symmetrical holes on a ruler AB, C, D, C, and D. The distance between them is exactly the distance between two people. Now let the ruler AB be parallel to a plane mirror. The person looks through both C and D holes with two eyes. In the mirror image of A’B’, to see the complete image like A’B’, the width of the plane mirror is at least how much? Analysis: According to the characteristics of plane mirror imaging and object symmetry, make the ruler AB in the plane mirror in Figure 1. The virtual image A’B’. The scope of the mirror width of the human left eye through the C hole to view the whole image in the mirror is MQ (the connecting line of C and A’ intersects the plane mirror in M, C and