Sam purchases +3.50-D eyeglasses which correct his faulty vision to put his near point at 25 cm. (Assume he wears the lenses 2.0 cm from his eyes.) Calculate (a) the focal length of Sam's glasses, (b) Sam's near point without glasses, (c) Pam, who has normal eyes with near point at 25 cm, puts on Sam's glasses. Calculate Pam's near point with Sam's glasses on.
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Positive focal length indicates that the lens is converging. Therefore, Sam is farsighted.
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(c) For the second person we find the object distance which will give an image at her near point. The near point
The distance of object from the eyes = (13+ 2) = 15 cm