Describing a lens or surface that curves outward equally on both sides.
From Latin 'aequus' (equal) + 'convexus' (curved outward). This optical term emerged in the study of lenses in the 17th-18th centuries.
An equiconvex lens is perfectly symmetrical—both sides bulge outward the same amount—which is why it's a classic choice for magnifying glasses and microscopes because the symmetry reduces optical distortions.
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