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Optic lens homework

  1. Aug 31, 2008 #1
    If a lens is moved towards the object from a distance of 20cm to 15cm, the magnification of the image remains the same. What is the focal length of the lens?

    Sorry I am new here so please forgive me if I have violated any rules.:cry:
     
  2. jcsd
  3. Aug 31, 2008 #2

    tiny-tim

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    Welcome to PF!

    Hi Euler_Euclid! Welcome to PF! :smile:

    Hint: what equations do you know that apply to distance, magnification, and focal length? :wink:
     
  4. Aug 31, 2008 #3
    Re: Optics

    Can you please help me a little more?
     
  5. Aug 31, 2008 #4

    tiny-tim

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    oh come on …

    you must know some equation about lenses … :smile:
     
  6. Aug 31, 2008 #5

    Redbelly98

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    Re: Optics

    FYI:

    More at https://www.physicsforums.com/showthread.php?t=5374
     
  7. Aug 31, 2008 #6
    Re: Optics

    OK Sorry. I got it now!!

    Thanks.
     
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