A farsighted person has a nearpoint of 50 cm from her eyes. She wants glasses that will let her see objects at a distance of only 25 cm from her eyes….

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A farsighted person has a nearpoint of 50 cm from her eyes. She wants glasses that will let her see objects at a distance of only 25 cm from her eyes. Determine the focal length of the glasses needed if the glasses are 2 cm and 3 cm from her eyes.

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