A convex lens has focal length of 40 cm what is power
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Answer:
power of convex lens is 2.5 D
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Explanation:
Power of a lens is always reciprocal to the focal length. So, a convex lens with 40cm focal length has a power of (1/0.4) Dioptre(D) or 2.5D. Since, a convex lens is a converging lens, the power of the convex lens is +2.5D.
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