Examples of focal length in a Sentence
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Any eyepiece with a focal length in excess of 20mm is fine for low-power views.
—
Anthony Wood, Space.com, 15 Nov. 2025
In their experiments, the researchers showed that the plasma lens could focus light across a wide range of XUV wavelengths, with its focal length adjustable by tuning the plasma density.
—Neetika Walter, Interesting Engineering, 5 Nov. 2025
The macro photos can be shot as 48-megapixel files, but all the other focal lengths have smaller sensors due to the cropping.
—Jakob Schiller, Outside, 23 Sep. 2025
Even though the aperture opens to f/1.4, the 12mm focal length simply doesn't provide enough compression for the effect when taking photos with a distant focus point.
—PC Magazine, 23 Sep. 2025
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Anthony Wood, Space.com, 15 Nov. 2025
In their experiments, the researchers showed that the plasma lens could focus light across a wide range of XUV wavelengths, with its focal length adjustable by tuning the plasma density.
—Neetika Walter, Interesting Engineering, 5 Nov. 2025
The macro photos can be shot as 48-megapixel files, but all the other focal lengths have smaller sensors due to the cropping.
—Jakob Schiller, Outside, 23 Sep. 2025
Even though the aperture opens to f/1.4, the 12mm focal length simply doesn't provide enough compression for the effect when taking photos with a distant focus point.
—PC Magazine, 23 Sep. 2025
See All Example Sentences for focal length
Cite this Entry
“Focal length.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/focal%20length. Accessed 25 Nov. 2025.
Copy CitationMedical Definition
focal length
noun
: the distance of a focus from the surface of a lens or concave mirror
—symbol f
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