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Optics question, can anyone confirm my answer?

  1. Sep 23, 2012 #1
    1. The problem statement, all variables and given/known data
    Two converging lenses of focal length=27cm are placed 16.5cm apart. If an object is placed 35cm in front of the first lens, where will the final image be produced? What will be the total magnification?


    2. Relevant equations
    1/f=1/di+1/do
    do2=D-di1
    M=-di/do

    3. The attempt at a solution
    1/f1=1/di1+1/do1
    1/27=1/35+1/di1
    di1=118.125cm

    do2=D-di1
    do2=16.5-116.125
    do2=-101.625cm

    1/f2=1/do2+1/di2
    1/27=1/-101.625+1/di2
    di2=21.33cm<<<<<

    Mt=M1M2=(-21.33/-101.626)(118.125/35)=0.785X<<<<<


    If something is wrong, please show me my mistake, and if it's right please let me know!
     
  2. jcsd
  3. Sep 23, 2012 #2

    Redbelly98

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    Staff Emeritus
    Science Advisor
    Homework Helper

    I agree with your value of di2.

    For the magnification, try calculating it again -- I agree with the values 21.33, 101.6, 118.1, and 35, but I get a different final answer.

    Also -- again on the magnification -- is M1 positive or negative? How about M2? What does that make Mt?

    Hope that helps.

    p.s. Welcome to Physics Forums.
     
  4. Sep 23, 2012 #3
    Thanks a lot :)
     
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