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concave spherical lens |
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concave spherical lens Etymology: L, concavare, to make hollow; Gk, sphaira, ball; L, lentil a lens with curved, depressed surfaces that cause light rays to diverge. It is used for the management of myopia (nearsightedness). How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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