A person whose near-point distance is 42.5 cm wears a pair of glasses that are 2.1 cm
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A person whose near-point distance is 42.5 cm wears a pair of glasses that are 2.1 cm from her eyes. With the aid of these glasses, she can now focus on objects 25 cm away from her eyes. Find the focal length and refractive power of her glasses.
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