|Mar26-12, 07:59 PM||#1|
A farsighted man with eyeglasses problem
1. The problem statement, all variables and given/known data
A farsighted man uses eyeglasses with a refractive power of 2.20 diopters. Wearing the glasses 0.03 m from his eyes, he is able to read books held no closer than 0.28 m from his eyes. He would like a prescription for contact lenses to serve the same purpose. What is the correct contact lens prescription, in diopters?
2. Relevant equations
1/do + 1/di = 1/f
3. The attempt at a solution
well starting off i figured if the power is +2.20 dipoeters then the fd is going to be -1/2.20
not sure but since with the glasses it would be 1/fd-.03? and then with the contacts what would happen since there no distance? im just really confused now lol
|Mar26-12, 11:33 PM||#2|
500 views no replies? any ideas?? anyone lol!?
|Mar27-12, 12:51 AM||#3|
Find out at what distance d from the eye the image forms with the ordinary eyeglasses when the book is held at 0.28 m from the eye. What should be the focal distance when the lens is on the eye and the distance of the image is equal to d in the same situation?
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