有一个长方形灯具，长40mm，高20mm。发出1°立体角的光，穿过透镜，在透镜焦点处设置光栅，查看追迹情况，再做一个长方形灯具面上某一点（x，y）发出的1°立体角的光，追迹光线穿过透镜在光栅上的分布情况。
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