Power of convex lens of 20 cm focal length is
Power of convex lens of 20 cm focal length is
(a) - 5D
(b) + 5D
(c) + 0.5D
(d) - 0.5D
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Power of convex lens of 20 cm focal length is
(a) - 5D
(b) + 5D
(c) + 0.5D
(d) - 0.5D