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
- Convex concave lens
- Plano Concave lens
- Double convex lens
- 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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