focal ratio

noun

Examples of focal ratio in a Sentence

Recent Examples on the Web
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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

Time Traveler
The first known use of focal ratio was in 1883

Dictionary Entries Near focal ratio

Cite this Entry

“Focal ratio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/focal%20ratio. Accessed 22 Nov. 2024.

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