在几何光学中,凹透镜的成像规律是:物体放在距凹透镜任何位置,通过凹透镜所成的像总是正立、缩小与物同侧的虚像,凹透镜没有实焦点。但笔者在偶尔观察凹透镜成像时,看到了笔者在凹透镜里成了“放大虚像”。又在一次手持凹透镜对着太阳光观察时看到了在太阳入射的一方有一个亮点 In geometric optics, the imaging law of a concave lens is: the object is placed at any position from the concave lens, and the image formed by the concave lens is always upright and reduces the virtual image on the same side as the object. The concave lens has no real focus. However, when the author observed the concave lens imaging occasionally, he saw that the author became a “magnified virtual image” in the concave lens. Another time, when holding a concave lens to the sun, you see a bright spot on the incident side of the sun.