Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光学的基础定义出发，阐述光
度和顶度的差别，并对度计的测量原理和
差进行正确分析。
点计Explain the difference between power and vertex power from basic definitions of optics, and analyze the measuring principle and error of focimeter.
从光学的基础定义出发，阐述光度和顶度的差别，并对度计的测量原理和差进行正确分析。
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