#### Question

Calculate the focal length of a corrective lens having power +2.5 D.

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#### Solution

Solution: Data: Convex lens, P = +2.5 D, f = ?

P = 1/f

∴ 2.5 D = 1/f

∴ f = 1/2.5D = 0.4m = 40cm

The focal length of the lens is 40 cm.

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Solution for question: Calculate the Focal Length of a Corrective Lens Having Power +2.5 D. concept: Refraction at Spherical Surfaces and by Lenses - Power of a Lens. For the courses SSC (English Medium), SSC (Marathi Semi-English)