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平面镜所成的像和物体到镜面的距离相等, 像与 物体的大小相等, 像与物体的连线跟镜面垂直, 即像 和物体关于平面镜对称. 在解答与平面镜成像有关的 一类问题时, 若将物体与物体所成的像转换为轴对称 图形, 把平面镜看作对称轴, 往往能化难为易, 化繁为 简.下面举例来说明. 例1
The image formed by the plane mirror is equal to the distance from the object to the mirror surface. The image is equal to the size of the object. The line connecting the object is perpendicular to the mirror surface. That is, the image and the object are symmetrical about the plane mirror. When solving the problems related to the imaging of the plane mirror, If the image formed by the object and the object is converted into an axisymmetric figure and the plane mirror is regarded as an axis of symmetry, it is often difficult to make it easier and it is more complicated. Here is an example to illustrate. Example 1