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what is concave and convex lens ?
A lens can be defined as a transparent medium having one flat and one curved surface or both curved surfaces.Lenses that are made of two curved surfaces are of two types- convex and concave.

Convex lens : A convex or converging lens is thick in the middle and thin at the edges.It can be made by joining two curved surfaces.A convex lens usually magnifies image.

Concave lens : A concave or diverging lens is thin in the middle and thicker at the edges.Objects look smaller through concave lenses.


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