試題詳解

52. If a farsighted patient’s near point of eyes is 40 cm, what kinds of lens and focal length of a corrective lens have to enable the eye to see clearly an object 20 cm away?
(A) converging lens, f = 13.3 cm
(B) diverging lens, f = 13.3 cm
(C) converging lens, f = 40 cm
(D) diverging lens, f = 40 cm
(E) converging lens, f = 20 cm