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关于物体在平面镜里所成象的性质,初中教科书及其它参考书都有,物体在平面镜里成“正立、等大、虚象”的结论。但学生在实际生活中观察到“人离平面镜越近,则看到自己的像越大”的现象。那么是否当人逐渐走近平面镜时,镜中的像的大小在不断增大呢?学生还观察到湖边景物在平静湖面成的是倒立的象,觉得也有悖于平面镜成象性质。笔者认为如果不向学生讲清其中的道理,会使学生对物理规律的科学性发生怀疑。下面就平面镜成象性质中的疑问谈谈本人的看
With regard to the nature of objects imaged in plane mirrors, junior high school textbooks and other reference books, objects in the plane mirror into a “vertical, equal large, virtual image” conclusion. However, students observed in real life that “the closer the person is to the plane mirror, the more his own image is seen”. Then, when people gradually approach the plane mirror, the size of the image in the mirror continues to increase? Students also observed that the lake scenery in the calm lake into an inverted image, that there is also contrary to the imaging properties of the plane mirror. The author believes that if students do not explain the truth to them, students will doubt the scientific nature of physical laws. Let’s talk about my own view on the question of imaging properties of plane mirrors.