如图所示等边三角形abc为透明柱状介质的横截面一束平行于角平分线bd的单色光由ab面射入介质经ab面折射的光线恰好平行于bc.则介质对此 Template




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tomski如图所示等边三角形abc为透明柱状介质的横截面一束平行于角平分线bd的单色光由ab面射入介质经ab面折射的光线恰好平行于bc.则介质对此 coloring