如图所示从光源�出的一束光线穿过�属板上的小孔进入烟箱按图示那样传播则abc三个位置上 必然分别放置着 Aa是凹透镜b是平板 Template




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tomski如图所示从光源�出的一束光线穿过�属板上的小孔进入烟箱按图示那样传播则abc三个位置上 必然分别放置着 aa是凹透镜b是平板 coloring