Which the following statement is true ? * Aconvex lens has 4D power having a focal length 0.25 m B convex lens has -4D power having a focal length 0.25 m C concave lens has 4D power having a focal length 0.25 m D concave lens has -4D having a focal length 2.5 m
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B if I am not wrong (•‿•)(•‿•)(•‿•)
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