Write a formula to find the focal length of a biconvex lens that is used to correct the defect of hypermetropia.
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Calculation of focal length and power of correcting lens in hypermetropia: Let y = distance of the near point N' from the defective eye. Now, the near point N of the normal eye is at distance D = 25 cm. The object placed at N forms its virtual image at N' due to the convex lens used for correction of the defect.
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f=25d/d-25 (d is distance of near point)
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