In common physics optical experiment, single lens is used often as to wait for measuring lens in measuring of focal length.
在普通物理光学实验中，焦距的测量通常使用单透镜作为待测透镜。
In common physics optical experiment, single lens is used often as to wait for measuring lens in measuring of focal length.
在普通物理光学实验中，焦距的测量通常使用单透镜作为待测透镜。
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