笔者近日看到一道题目及其解析,觉得很有必要再作一探讨。 原题:把甲、乙两只机械表均放在如图1所示的凸透镜的主轴上,手表的表面正对透镜且与主轴垂直,在透镜另一侧的适当位置观察手表的像,像中秒针旋转的方向与实际秒针旋转的方向有何差异? The author recently saw a topic and its analysis, and felt that it was necessary to make another study. The original title: Put the two mechanical watches A and B on the main shaft of the convex lens shown in Figure 1. The surface of the watch is facing the lens and perpendicular to the main axis. Observe the image of the watch in the appropriate position on the other side of the lens. What is the difference between the direction in which the second hand rotates and the direction in which the actual second hand rotates?