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gylx1206:几何光学书上有 (2011-12-21 09:51) X\m\yv}}
362429208b:tan汇聚角度=长度一半除以焦距 够通俗了吧 (2011-12-20 17:20) 4tkT\.
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小猫悖悖:长度一半是指透镜的长度吗,还是后焦 (2011-12-23 08:34) H<!q@E ;
小猫悖悖:在应用光学上,可以用半孔径/焦距来求出一个角度,乘2就是一个全角,这个就是会聚角度吗 (2011-12-23 08:33) 4Ia'Yr
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