Which the following statements is true?(A) aconvex lens has 4 dioptre power having a focal length 0.25m(B) aconvex lens has -4Dioptre power having a focal length 0.25m(C) A concave lens has 4 dioptre power having a focal length 0.25m(D) a concave lens has -4 dioptre power having a focal length 0.25m
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- a convex lens has 4 dioptre power having a focal length 0.25 metre
Explanation:
the focal length of a convex lens is always positive
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