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Find the distance between and object and its image

  1. Aug 29, 2013 #1
    1. The problem statement, all variables and given/known data

    How far apart are an object and an image formed by a 72.4 cm focal length converging lens if the image is 2.54x larger than the object and is real?
    (in cm)


    2. Relevant equations

    m=-(di/do)

    m=f/(f-do)

    (1/di)+(1/do)=(1/f)


    3. The attempt at a solution

    I've tried manipulating these equations to find the distance, but either I don't come up with a reasonable value or I end up with too many variables.
     
  2. jcsd
  3. Aug 30, 2013 #2

    ehild

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    Homework Helper
    Gold Member

    Hi caitg, welcome to PF.
    Would you please show your work in detail?

    ehild
     
  4. Aug 30, 2013 #3

    PeterO

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    Homework Helper

    A simple ray trace will give you some guidance.
     
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