1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Determing Near Point

  1. Apr 26, 2009 #1
    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?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted