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Optic Question; I need somebody's help

  1. Jan 16, 2007 #1
    Hi everyone
    This is my exercise.

    Calculate the longitudinal magnification of an object of length L placed along the principal axis of a lens (of focal length f) with the end B at distance H from the lens :confused:

    I've attached the image of this problem
    I prefer the solution next sunday :smile:

    Thank you so much

    Oh! I forget "f" in the picture, It's below the lens...
    Last edited: Jan 16, 2007
  2. jcsd
  3. Jan 16, 2007 #2


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    Welcome to PF, Jona.

    Please note that we do not do your homeworkf for you here! You must first show your efforts, so we can guide you to the answer. Although I can't see the image yet (it needs to be approved) I guess from the above comment, that you haven't put your working in there. So, do you have any thoughts as to how to solve the problem?
  4. Jan 16, 2007 #3


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    I would post the solution but I'll follow the OP's request of posting it next Sunday...

    ...actually, I won't be at work as it's a Sunday.

    Guess I'll have to leave this one.

    Hey-ho :tongue: :biggrin:
  5. Jan 16, 2007 #4
    Really it's my brother homework and
    I may solve this one for him if I've enough time
    And I write down that "I prefer the solution next sunday"
    Because he shout to me like that, so thanks for your all advices.

    And I may put my solution in this post and attach that image again
    Thank you so much.
  6. Jan 16, 2007 #5

    That pic is in his notebook
    I think it's a strange pic -*-
  7. Jan 16, 2007 #6
    If you think you are doing your 'brother' a favour by doing his homework, you are very mistaken.

    Just as by doing your homework, we would not be doing you a favor-- but rather a disservice.
    Last edited: Jan 16, 2007
  8. Jan 16, 2007 #7


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    I agree. If your brother needs help, then by all means help him if you can. But doing it for him will not help him learn at all!
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