what is the concave lens???
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intimate friend or associate : companion " … reflecting upon all my comrades that were drowned … "— Daniel Defoe. b : a fellow soldier comrades in battle. 2 [from its use as a form of address by communists] : communist.
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concave lens is a lens that possesses at least one surface that curves inwards. ... It is a diverging lens, meaning that it spreads out light rays that have been refracted through it. A concave lens is thinner at its centre than at its edges, and is used to correct short-sightedness (myopia).
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