已知凸透镜l1的焦距为f1凹透镜l2的焦距为f2且f1＞f2．若把它们的主轴重合相互平行放置并适当调节两块透镜中心之间的距离可使一束 Sketch Coloring Page

已知凸透镜l1的焦距为f1凹透镜l2的焦距为f2且f1＞f2．若把它们的主轴重合相互平行放置并适当调节两块透镜中心之间的距离可使一束 Template

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tomski已知凸透镜l1的焦距为f1凹透镜l2的焦距为f2且f1＞f2．若把它们的主轴重合相互平行放置并适当调节两块透镜中心之间的距离可使一束 coloring

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