What are concave lens
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A 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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Explanation:
Convex lens is a lens that cirved inward and it is also called diverging lens.
Concave lens is thinner in centre
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