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0. If a lens has power -2.5, then it is a (NTSE Madhya Pradesh, Stage-I, 2012-13)
Convex lens, with a focal length of 40 cm
Concave lens with a focal length of 40 cm
Convex lens with a focal length of 0.4 cm
Concave lens with a focal length of 0.4 em
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