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单词
focal ratio
释义
focal ratio
noun
:
f-number
Example Sentences
Recent Examples on the Web
An eyepiece changes the
focal ratio
of your telescope, thus changing the magnification.
Cameron Johnson,
Popular Mechanics
, 10 Nov. 2020
Word History
First Known Use
1883, in the meaning defined above
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更新时间:2024/9/21 16:36:16