what is meant by concave lens
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The lens which is thinner at the center as compared to edges is called a concave lens. ... When parallel rays fall on it the rays does not meet at common point but these appears to diverge from a common point.
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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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