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If one of the surfaces of a lens is concave and the other is convex such that the central region of the lens is thinner than its edges, is is called
  1. Convex concave lens
  2. Plano Concave lens
  3. Double convex lens
  4. concave convex lens
Explanation

 Short-sight defect could be corrected by using concave lens while long-sight defect could be corrected by using convex lens.


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