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2000年高考理科综合能力测试题中有一道几何光学选择题: 如图1所示,凸透镜L的焦距为f,在离透镜1.5f处垂直放置一平面镜M,现在焦
2000 college entrance examination science comprehensive ability test questions have a choice of geometric optics: as shown in Figure 1, the focal length of the convex lens L f, at a distance of 1.5f from the lens perpendicular to a plane mirror M, now coke