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如图2．4所示谐振腔： (1)画出其等效透镜序列。如果光线从薄透镜右侧开始，反时针传播，标出光线的一个往返传输周期； (2)求当d／F(F是透镜焦距)满足什么条件时，谐振腔为稳定腔； (3)指出光腰位置(不用计算)。
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