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A person with normal vision can focus on objects as close as a few centimeters from the eye up to objects infinitely far away. There exist, however, certain conditions under which the range of vision is not so extended. For example, a nearsighted person cannot focus on objects farther than a certain point (the far point), while a farsighted person cannot focus on objects closer than a certain point (the near point). Note that even though the presence of a near point is common to everyone, a farsighted person has a near point that is much farther from the eye than the near point of a person with normal vision.
Both nearsightedness and farsightedness can be corrected with the use of glasses or contact lenses. In this case, the eye converges the light coming from the image formed by the corrective lens rather than from the object itself.
1. If a nearsighted person has a far point dfd_f that is 3.50mm from the eye, what is the focal length f1f_1 of the contact lenses that the person would need to see an object at infinity clearly? Express your answer in meters
2.
If a farsighted person has a near point that is 0.600m m from the eye, what is the focal length f2 f_2 of the contact lenses that the person would need to be able to read a book held at 0.350m m from the person's eyes?
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Added Fri, 24 Jul '15
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1) See http://toughstem.com/question-answer-solution/nearsighted-person-far-point-dfd-mm-eye-focal-length-contact-lenses-person

2) See http://toughstem.com/question-answer-solution/farsighted-person-near-point-eye-focal-length-contact-lenses-person-need-able
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