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CONCAVE LENS
Concave or diverging lens :It is thicker at the center than at the edges.It diverges a beam of light on refraction through it.It has a virtual focus.
Types of concave lenses:

(a) Double concave or biconcave lens : Both the surfaces are concave.It is simply called a concave lens. 
(b)Planoconcave lens : One surface is concave and the other is plane.
(c) Convexoconcave : One surface is concave and the other is convex.


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