A person is to be tted with bifocals. She can see clearly
Chapter 25, Problem 25.16(choose chapter or problem)
A person is to be tted with bifocals. She can see clearly when the object is between 30 cm and 1.5 m from the eye. (a) The upper portions of the bifocals (Fig. P25.16) should be designed to enable her to see distant objects clearly. What power should they have? (b) The lower portions of the bifocals should enable her to see objects comfortably at 25 cm. What power should they have?
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