笔者在辅导光学竞赛部分时,发现有几本竞赛书对同一道光学竞赛题的解答似有值得商榷之处.题目:薄壁透明圆柱形玻璃容器浮于水面,容器的内底面与容器外水面的高度差为h,容器的内直径为D.在容器底正中放有一个小物体A,如图1所示,实验证明,在水面上方容器外侧存在一个看不见物体A? When I was coaching the optical contest, I found that there were several contest books that were worthy of discussion on the answer to the same optical competition. Title: Thin-walled transparent cylindrical glass container floats on the surface of the water, the inner surface of the container and the outer surface of the container The height difference is h, and the inner diameter of the container is D. Place a small object A in the middle of the bottom of the container. As shown in Figure 1, the experiment shows that there is an invisible object A on the outside of the container above the water surface.