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Determing Near Point

by Cheezay
Tags: determing, point
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Apr26-09, 01:11 PM
P: 26
1. The problem statement, all variables and given/known data

1.Without glasses, your uncle Albert can see things clearly only if they are between 28.4 cm and 137 cm from his eyes. What power eyeglass lens will correct your uncle's myopia? Assume the lenses will sit 2.47 cm from his eyes. Give answer in diopters. Do not enter unit.
2.What is your uncle's near point when wearing these glasses?

My professor left this additional note: Part B asks ''What is your uncle's near point when
wearing these glasses?''. When you calculate the
new near point assume it is the distance between
the object and uncle Albert's glasses. The correct
answer is then always accepted by Lon-Capa.
2. Relevant equations

3. The attempt at a solution
I've figured out the first part of the question, with the correct answer listed. However i'm not sure how to set up an equation for the 2nd part. Do I use the thin lens equation,
(1/f)=(1/di)+(1/do), using my answer for partA to find f, and 28.4 for di, and solve for do?
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