A person with normal vision can focus on objects as close as afew centimeters fr

Question

A person with normal vision can focus on objects as close as afew centimeters from the eye up to objects infinitely far away.There exist, however, certain conditions under which the range ofvision is not so extended. For example, a nearsightedperson cannot focus on objects farther than a certain point (thefar point), while a farsighted person cannot focus onobjects closer than a certain point (the near point). Note thateven though the presence of a near point is common to everyone, afarsighted person has a near point that is much farther from theeye than the near point of a person with normal vision.

Explanation / Answer

given near point is 0.60m so the image distanec from the eyes is di = -0.60mhere negative is used because the image is on the same side of thelens. object distance is from the eyes do = 0.350m we have the thin lens equation as 1/f = 1/do + 1/di or f = do*di /di+do calculating we get focal length as       f = 0.84m

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