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【简答题】
如图5．4所示(忽略符号)，L1、L2是两个会聚透镜，Q是物点，DD是光阑。已知焦距f1=2a，f2=a，图中标示各距离为s=10a，l=4a，d=6a，此外透镜与光阑半径关系是r1=r2=3r3，求此光组的孔径光阑、入瞳、出瞳、入射窗和场阑的位置和大小。
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