Eyes: The near point of a farsighted person's uncorrected eyes is 80 cm. What power contact lens should be used to move the near point to 25 cm from this person's eyes?

Name: Eyes: The near point of a farsighted person's uncorrected eyes is 80 cm. What power contact lens should be used to move the near point to 25 cm from this person's eyes?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

The lens formula is 1/f = 1/v - 1/u. For the near point correction, v = -25 cm and u = -80 cm. Solving gives f = 35.7 cm, and power P = 1/f = 2.8 diopters.

Eyes: the near Point of a Farsighted Person's Uncorrected Eyes