一问:平面镜对光路的控制有何规律?答:根据光的反射定律可知:1.平行光线经平面镜反射后仍然平行,如图1所示。2.会聚光线经平面镜反射后仍然会聚,如图2所示。3.发散光线经平面镜反射后仍然发散,如图3所示。可见,对于平面镜,若入射光线平行(即平行光束),则反射光线也平行;若入射 One question: What law does the plane mirror have on the control of the light path? Answer: According to the law of light reflection, it can be known that: 1. The parallel rays are still parallel after being reflected by the plane mirror, as shown in Figure 1. 2. Convergent light still converges after being reflected by a plane mirror, as shown in Figure 2. 3. The divergent light still diverges after being reflected by the plane mirror, as shown in FIG. It can be seen that for a plane mirror, if the incident rays are parallel (ie, parallel beams), the reflected rays are also parallel; if incident