《物理教学》1985年11期《奇异的小针—第二课堂教学初探》一文,谈到漂浮在水面上的小针在碗底形成的影的大小比小针本身大很多这一现象,我认为针后黑暗区域的形成,是由于此时水的表面弯曲使光发生折射所致,并非简单地由针本身挡住一部分光所致。当小针漂浮在水面上时,水 “Physics Education”, Issue 11 of 1985, “Strange Small Needles - A Preliminary Study of the Second Classroom Teaching”, talking about the phenomenon that the size of a small needle floating on the surface of the water at the bottom of the bowl is much larger than the size of the small needle itself. It is considered that the formation of a dark area behind the needle is caused by the fact that the surface of the water is bent so that the light is refracted, not simply because the needle itself blocks a part of the light. When the small needle floats on the water, the water