【初二物理题】【最好有图】是画凸透镜成像的,今天上午听课有点不懂= =|||1.u>2f2.f<u<2f3.u<f上几张图,感激不尽刚注册的马甲,分不多,我希望大侠们可以帮帮我= =|||谁在补充下?

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