Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光学
基础定义出发，阐述光焦
和顶焦差别，并对焦
测量原理和
差进行正确
。
Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光学基础定义出发，阐述光焦和顶焦差别，并对焦测量原理和差进行正确。
明：以上例句、词性
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