平面镜对光线有反射作用 ,成像的特点是成正立放大的虚像 ,像与物的连线与镜面垂直 ,像与物到镜面的距离相等 ,当物体在镜前运动时 ,无论何时都成正立等大的虚像 ,也就是像的大小不变。而且始终满足两者到镜面的距离相等。因此 ,物体移动时 ,在平面镜中所成的像必然发生移动 , The plane mirror has a reflection effect on the light. The image is characterized by an upright enlarged virtual image, which is like the vertical line between the object and the mirror, and the distance from the object to the mirror is equal. When the object moves in front of the mirror, it becomes an upright position whenever The large virtual image, that is, the size of the image does not change. And always meet the same distance from the mirror. Therefore, when the object moves, the image formed in the plane mirror must move.