A person is nearsighted and can clearly focus on objects, Ask an Expert

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A person is nearsighted and can clearly focus on objects that are no farther than 2.6 m away from her eyes. She borrows a friend's glasses but the borrowed glasses make things worse; that is, the person can now focus only on objects that are within 1.85 m away. What is the focal length of the borrowed glasses? please show your work

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