Contact lenses are placed right on the eyeball, so the distance from the eye to

Question

Contact lenses are placed right on the eyeball, so the distance from the eye to an object (or image) is the same as the distance from the lens to that object (or image). A certain person can see distant objects well, but his near point is 49.0 cm from his eyes instead of the usual 25.0 cm .

A) is this person near or far sighted?

B) is a diverging or converging lens needed to correct his vision?

C) of the correcting lenses will be contact lenses, what focal length lens are needed, in cm?

D) What is the power corresponding to the focal length found in part C in diopters?

Explanation / Answer

A) Person is far sighted

B) Converging lens as the image is formed behind retina....so used to bring the image closer

C) distance of lens from eye =0

so

1/f =(-1/49)+(1/25) = 51.04 or approx 51 cm

D) power = 1/f =.019 D

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