A person is to be fitted with bifocals. He can see clearly when an object is bet

Question

A person is to be fitted with bifocals. He can see clearly when an object is between 30.0 cm and 1.50 m from his eye without bifocals.
a) What is the lens power of the upper part of the bifocals that allow him to see distant objects clearly?

b) What is the lens power of the lower part of the bifocals that allow him to see objects located at the normal near point of 25.0 cm? A person is to be fitted with bifocals. He can see clearly when an object is between 30.0 cm and 1.50 m from his eye without bifocals.
a) What is the lens power of the upper part of the bifocals that allow him to see distant objects clearly?

b) What is the lens power of the lower part of the bifocals that allow him to see objects located at the normal near point of 25.0 cm?

Explanation / Answer

A person is to be fitted 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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