Examples of focal ratio in a Sentence
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The focal ratio gives users a wide field of view, which allows your child to observe star clusters and other wide-angle targets.
—
Tantse Walter,
Space.com,
9 Apr. 2025
An eyepiece changes the focal ratio of your telescope, thus changing the magnification.
—
Cameron Johnson,
Popular Mechanics,
10 Nov. 2020
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Tantse Walter,
Space.com,
9 Apr. 2025
An eyepiece changes the focal ratio of your telescope, thus changing the magnification.
—
Cameron Johnson,
Popular Mechanics,
10 Nov. 2020
Cite this Entry
“Focal ratio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/focal%20ratio. Accessed 5 Jul. 2026.
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