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If the focal length of a convex lens is 50cm, which one of the following is its power?
+2 dioptre
+0.02 dioptre
-0.5 dioptre
+0.5 dioptre
Power of a lens is always reciprocal to the focal length. So, a convex lens with 50cm focal length has a power of (1/0.5) Dioptre (D) or 2D. Since, a convex lens is a converging lens, the power of the convex lens is +2D.
By: Munesh Kumari ProfileResourcesReport error
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