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透镜及其应用

> 用照相机拍照时，人到镜头的距离应远远____________镜头的焦距（选择“大于’或‘小于”）如图所示，人的眼球好像一架照相机，晶状体和角膜的共同作用相当于一个____________透镜，外界物体在视网膜上所成的像是___________的实像（选项“正立” 或“ 倒立”）。

问题：

发布时间：2024-09-11

用照相机拍照时，人到镜头的距离应远远__镜头的焦距（选择“大于’或‘小于”）如图所示，人的眼球好像一架照相机，晶状体和角膜的共同作用相当于一个透镜，外界物体在视网膜上所成的像是_的实像（选项“正立” 或“ 倒立”）。

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