Concave lens or minus lens is a diverging lens. it is of three types: biconcave,plano-concave and convex-concave (meniscus)
Identification of concave lens.
1.It is thin in the center and thick at the periphery.
2.An object seen through it appears minified.
3.When the lens is moved, the object seen through it moves in the same direction as the lens.
Identification of concave lens
1. for correction of myopia
2. as Hruby lens for fundus examination with sitl-lamp.
Image formation by a concave lens.
A concave lens always produces a virtual, erect and diminished image of an object
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