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例1 (2003年重庆市竞赛题)如图1所示,点光源S在平面镜前,请画出由S发出,能经过A点的光线. 分析:S点发出的光通过A点的光线有两条,一条是光的直线传播通过A点的光线;另一条是经平面镜反射后通过A点的光线.
Example 1 (Chongqing Competition in 2003) As shown in Fig. 1, the point source S is in front of the plane mirror. Please draw a line that emits from S and can pass through point A. Analysis: The light emitted from point S passes through point A Two, one is the straight line of light propagating through point A; the other is the light passing through point A after being reflected by a plane mirror.