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!

Determine image distance relative to lens

  1. Mar 29, 2009 #1
    1. The problem statement, all variables and given/known data
    Two identical diverging lenses are separated by 13 cm. The focal length of each lens is -6.5 cm. An object is located 3.0 cm to the left of the lens that is on the left. Determine the final image distance relative to the lens on the right.


    2. Relevant equations
    1/i + 1/o = 1/f

    1/i = 1/f - 1/o

    3. The attempt at a solution
    1/i = 1/-6.5 - 1/3
    i= -.487

    13 + .487 = 13.487 cm

    I feel like I'm not doing this right at all.. can someone please let me know if I'm even on the right track?
     
  2. jcsd
  3. Mar 29, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    13 + .487 = 13.487 cm
    This is the object distance for the second lens. Find the final image distance from the second lens.
     
  4. Mar 30, 2009 #3
    Ok so I took 1/13.487 + 1/i = 1/-6.5

    and I solved for i and got -4.386 cm.

    Is this correct, or should I have used -13.487 and got -12.547 as my answer?
     
  5. Mar 30, 2009 #4

    rl.bhat

    User Avatar
    Homework Helper

    and I solved for i and got -4.386 cm.
    This is correct.
     
  6. Mar 30, 2009 #5
    It's telling me that answer is incorrect.. I guess I'll try the -12.547 next
     
  7. Mar 30, 2009 #6

    rl.bhat

    User Avatar
    Homework Helper

    1/i = 1/-6.5 - 1/3
    i= -.487

    Check this calculation.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Determine image distance relative to lens
Loading...