: the distance of a focus from the surface of a lens or curved mirror
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Functionality: Being a prime lens, features are minimal beyond the aperture and focal length.—James Abbott, Space.com, 23 May 2025 This made the humpback’s focal length—the distance between the eye’s lens and retina—shorter than expected, as Bolin tells bioGraphic’s Marina Wang.—Margherita Bassi, Smithsonian Magazine, 21 May 2025 This system provides an equivalent focal length of 200mm, which would require a really big lens on a standard camera.—Eric Zeman, PCMAG, 2 Mar. 2025 Longer focal length usually indicates sharper eyesight, so this was one sign that humpbacks may have poor vision.—Margherita Bassi, Smithsonian Magazine, 21 May 2025 See All Example Sentences for focal length
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