1. Not finding help here? Sign up for a free 30min 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!

Converging and diverging lenses

  1. Apr 28, 2008 #1
    1. The problem statement, all variables and given/known data
    a) A converging lens with a focal length of 15cm has an object 5cm tall placed 40cm to the left of it. To the right, 30 cm away, is a converging lens of focal length 10cm. use the thin lens and magnification formulae to locate the finale image. Find its magnification.

    b) Repeat part A for a -10cm diverging lens.

    2. Relevant equations
    1/f = 1/di + 1/do
    m = -(di/do)
    m = hi/ho

    3. The attempt at a solution
    i tried using a scaled diagram but im still pretty lost.....please help!
  2. jcsd
  3. Apr 28, 2008 #2


    User Avatar
    Homework Helper

    Once you find the image of the first lens (treating it like any other single lens problem), then the image of the first lens becomes the object of the second lens, and so you can find its image (which will be the final image). You might have to be careful of the sign conventions.

    For the total magnification, you find the magnification of each lens just as in a single lens problem. Once you have the separate magnifications, what would be the total magnification?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Converging and diverging lenses
  1. Diverging lenses (Replies: 1)