1如图1所示是一台投影仪的示意图.其中a是平面镜平面镜a的作用是改变光线的传播方�改变光线的传播方�b是凸透镜凸透镜b的作用是成放大 Template




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tomski1如图1所示是一台投影仪的示意图.其中a是平面镜平面镜a的作用是改变光线的传播方�改变光线的传播方�b是凸透镜凸透镜b的作用是成放大 coloring