Suppose the distance from the lens system of the eye (cornea +lens) to the retin

Question

Suppose the distance from the lens system of the eye (cornea +lens) to the retina is 13 mm. (a) What must the power of the lens be whenlooking at distant objects?
D
(b) What must the power of the lens be when looking at an object20.0 cm from the eye?
D
(c) Suppose that the eye is farsighted; the person cannot seeclearly objects that are closer than 1.0m. Find the power of the contact lens you would prescribe so thatobjects as close as 20.0 cm can be seenclearly.
D
(a) What must the power of the lens be whenlooking at distant objects?
D
(b) What must the power of the lens be when looking at an object20.0 cm from the eye?
D
(c) Suppose that the eye is farsighted; the person cannot seeclearly objects that are closer than 1.0m. Find the power of the contact lens you would prescribe so thatobjects as close as 20.0 cm can be seenclearly.
D

Explanation / Answer

(b) 1/q + 1/p = (1/0.20 m) + (1/.013 m) = 81.923 D
(c) (1/q) - (1/ p) = (1/0.20 m) - (1/1.0 m) = 4 D

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