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: Resolution of a microscope

  1. Jun 11, 2012 #1
    1. The problem statement, all variables and given/known data

    The image formed by a microscope objective with a focal length of 5 mm is 160mm from its second focal point. The eyepiece has a focal length of 26mm.

    a.what is the angular magnification of the microscope?

    2. Relevant equations


    m_o= linear magnification of objective. m_o=-L/f_o, where L is the distance from the first lens to the first image, and f_o is the focal length of the objective.

    M_e=25/f_e where M_e= angular magnification of the eyepiece.

    3. The attempt at a solution

    So M_e=25*10/26= 9.6154, since 25 is referring to the near point in cm, I converted it to mm.

    m_o= 160/5= 32

    However, the correct answer is 317 so I'm about 10 off and I don't know why. I think I may be using the L term incorrectly as I don't really understand what the 160mm value is referring too. Any help would about where I went wrong above would really be appreciated.

    Last edited: Jun 11, 2012
  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