# Optic Question; I need somebody's help

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

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

Thank you so much
Jona

Oh! I forget "f" in the picture, It's below the lens...

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cristo
Staff Emeritus
Welcome to PF, Jona.

Jona said:
I prefer the solution next sunday
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?

J77
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:

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.

That pic is in his notebook
I think it's a strange pic -*-

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.

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cristo
Staff Emeritus