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，阐述光焦
焦的差别，并对焦计的测量原理
差进行正确分析。
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，阐述光焦焦的差别，并对焦计的测量原理差进行正确分析。
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