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!

Focal Length

  1. Apr 3, 2009 #1
    1. The problem statement, all variables and given/known data
    When a diverging lens is held 12 cm above a line of print, as in Figure 26.29, the image is 4.1 cm beneath the lens. What is the focal length of the lens?

    2. Relevant equations
    1/di + 1/do = 1/f

    3. The attempt at a solution
    1/di + 1/do = 1/f
    1/4.1 + 1/12 = 1/f
    f = 3.0559 cm

    What did I do wrong?
  2. jcsd
  3. Apr 3, 2009 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    The image is virtual, so di is considered to be negative.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Focal Length
  1. Focal length (Replies: 2)

  2. Focal length (Replies: 1)

  3. Focal Length (Replies: 0)

  4. Focal length (Replies: 2)

  5. Focal length (Replies: 1)