通过对晴天正午树荫下的光斑进行观察,发现其形状和亮度有区别,在验证实验中发现光斑的形状及亮度与树叶间隙的大小及其到地面的距离有关。本文从理论上分析了小孔成像的分辨率与孔的大小及物距、像距的关系及定性分析了像距增大时为何像会由“不规则光斑”变为圆形的太阳的像。文中还给出了一种利用平面镜观察小孔成像的方法。 By observing the light spot at noon shade in sunny day, it is found that its shape and brightness are different. In the verification experiment, it is found that the shape and brightness of the light spot are related to the size of the leaf gap and the distance to the ground. This paper theoretically analyzed the resolution of small hole imaging and the size of the hole and the relationship between object distance and image distance, and qualitative analysis of why the image distance increases as the “irregular spot” into a circular sun Like. The article also gives a method of using the plane mirror observation hole imaging.