如图所示某透明介质的截面为直角三角形abc其中∠a=30°ac边长为l.一束单色光从ac面上距a为l3的d点垂直于ac边射入恰好在ab Template




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tomski如图所示某透明介质的截面为直角三角形abc其中∠a=30°ac边长为l.一束单色光从ac面上距a为l3的d点垂直于ac边射入恰好在ab coloring