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

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統計: A(7), B(3), C(42), D(7), E(3) #2016154

詳解 (共 3 筆)

#4645387
 使20cm之物成像於同側40cm, p...
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#3829076
farsighted - converg...
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#4596514
-2.5= -5+x , x=2.5
F=2.5 f=+40cm
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