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，阐述光焦度和顶焦度的差别，并对焦度计的测量原理和误差进行正确分析。
Measuring principle
英语例句库
英语百科
Measuring principle
Concepts for describing aspects of nature by numbers are called physical quantities. Examples may range from counting fruit to reading a thermometer gauge to determine temperature.
Acquiring such a number, a set of such numbers or related numbers directly from a natural system is called measurement. Examples include counting fruit or using a ruler to measure length.
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