Lens | Meaning, Principles, Manufacture, & Facts | Britannica
https://www.britannica.com/technology/lens-optics
WebNov 9, 2023 · A lens is a piece of transparent material, usually circular in shape, with two polished surfaces, either or both of which is curved and may be either convex (bulging) or concave (depressed). The curves are almost always spherical; i.e., …
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