A person is to be fitted with bifocals. She can see clearly when the object is between 32 cm and 2.1 m from the eye. The upper portions of the bifocals should be designed to enable her to see distant objects clearly. What power should they have? Answer I’m units of diopters The lower portions of the bifocals should en- able her to see objects comfortably at 25 cm. What power should they have? Answer in units of diopters.

A person is to be fitted with bifocals. She can see clearly when the object is between 32 cm and 2.1 m from the eye. The upper portions of the bifocals should be designed to enable her to see distant objects clearly. What power should they have? Answer I’m units of diopters The lower portions of the bifocals should en- able her to see objects comfortably at 25 cm. What power should they have? Answer in units of diopters.