皮皮学，免费搜题
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【简答题】
张老师是典型的远视眼，可以用凸透镜来矫正视力，可是在课堂上看近处课本上眼镜，观察远处同学摘下眼镜．这样下，非常不方便．替张老师买了一种新型眼镜如图所示，镜片M区厚度相同，N区可以矫正视力，现在张老师可以通过______区看书，通过______区看远处同学，再不需要频繁摘下眼镜．
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