在初中物理,我们学过光的入射与反射,假如把一束光放在三角形中照射会产生哪些有趣的现象呢?笔者结合“光学原理”以作图的方式演绎部分有趣的现象.例1在△ABC中,由顶点C发出一光线,经AB和BC反射回到顶点A,求作AB和BC上的入射点与反射点D、G.求作过程1.我们把AB和BC分别看作平面镜,由“光学原理”中的平面镜成像,作C、A分别关于AB和BC的对称点F、E, In junior middle school physics, we learned about the incidence and reflection of light. What fun phenomena would we produce if we put a beam of light in a triangle? The author combined the principle of “optics” to deduce some interesting phenomena. Example 1 In ABC, a light is emitted from the vertex C and reflected back to the vertex A by AB and BC for the point of incidence and reflection on the AB and BC D, G. Respectively, as a plane mirror, by the “optical principle” in the plane mirror imaging, for C, A, respectively, on the AB and BC symmetry points F, E,