A farsighted man uses eyeglasses with a refractive power of, Ask an Expert

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A farsighted man uses eyeglasses with a refractive power of 3.57 diopters. Wearing the glasses 0.026 m from his eyes, he is able to read books held no closer than 0.240 m from his eyes. He would like a prescription for contact lenses to serve the same purpose. What is the correct contact lens prescription, in diopters?

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