A farsighted librarian wears her 399-d refractive power, Ask an Expert

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A farsighted librarian wears her 3.99-D refractive power eyeglasses 0.0280 m from her eyes and is able to read books held no closer than 0.294 m from her eyes. As a matter of convenience, she decides to switch to contacts. Determine the refractive power for her contact lens prescription.

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