A person is to be fitted with bifocals. She can see clearly when the object is...
A person is to be fitted with bifocals. She can see clearly when the object is between 31.0 cm and ?1.80 m from the eye.
(a) The upper portions of the bifocals (see figure above) should be designed to enable her to see distant objects clearly. What power should they have?_____diopters
(b) The lower portions of the bifocals should enable her to see objects located 25 cm in front of the eye. What power should they have?______diopters
Homework Answers
A. Power (diopters) = 1/f f = -1.8 m; power = 1/-1.8 = -0.56 diopters.
B. By "comfortably" I assume the desire is to have her eyes relaxed, i.e., focused on what would be 1.8 m without glasses. power = 1/-1.8 + 1/0.25 = 3.41 diopters.(approx)
If instead the desire is to focus at 0.25m as her minimum distance, power = 1/-0.37 + 1/0.25 = 1.30 diopters
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