A farsighted man with eyeglasses problem

KendrickLamar

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

KendrickLamar

500 views no replies? any ideas?? anyone lol!?

ehild

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?

ehild