As a Treatment for Cataracts (A Cloudiness of the Lens

Multiple Choice

As a treatment for cataracts (a cloudiness of the lens of the eye) ,the natural lens is removed and a plastic lens is implanted.After this is done a person can see distant objects clearly,but he cannot accommodate to focus on nearby objects.If such a person wanted to read a book at a distance of 25 cm,he would have to wear contact lenses having a diopter power of

A) +2.78 diopters.
B) +3.33 diopters.
C) -1.78 diopters.
D) +4.00 diopters.
E) -4.00 diopters.