the concavity of the lens
The lower back forms a concavity.
The large concavities along the wall of the restaurant are like private rooms.
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Antonio Stradivari, for instance, carefully tinkered with the geometry of his violins—the relative concavity of the back and the front, the thickness of the wood—to produce his legendary results.—Chris Almeida, The New Yorker, 6 Jan. 2024 Fluted white marble columns sit on black granite pedestals, carrying the eye upward to where lines slide over, folds narrow, and concavities become convex.—Justin Davidson, Curbed, 3 Aug. 2023 The bump settled into the concavity of the sink.—Morgan Thomas, The Atlantic, 16 May 2021 In addition to measurements, scientists were also able to detect a large, broad concavity in one of the asteroid's two hemispheres as well as subtle dark and lighter regions that indicate small-scale surface features a few dozen meters across.—Ariana Garcia, Chron, 22 Feb. 2023 The right side of the head was one enormous concavity, which Lacassagne attributed to strikes from the bottle.—Douglas Starr, Discover Magazine, 28 Feb. 2011 Father pushed boards with his palm to make the concavity recede into dust.—Oliver De La Paz Victoria Chang, New York Times, 23 Nov. 2022 Trick skis are more likely to have a subtle concavity or flat bottom.—Chris Meehan, Popular Mechanics, 12 June 2022 However, toward the edges, the concavity flattens out, allowing a flat surface for riding straight.—Chris Meehan, Popular Mechanics, 12 June 2022
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