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Author Topic: Hi! I've got a simple difficult problem...  (Read 6597 times)
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razvan5050
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on: October 09, 2011, 04:41:56 pm » posted from:Bucharest,Bucuresti,Romania

So I have to make the diagrams for the image attached. In total there should be 4 diagrams, representing every time the object moves. Now, I've done the first diagram, that was easy, but the others... I just can't get my head around them...

Any help would be appreciated.

Thank you!


* untitledda.JPG (8.37 KB, 512x384 - viewed 282 times.)
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Fu-Kwun Hwang
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Reply #1 on: October 09, 2011, 07:20:50 pm » posted from:Idrija,Bohinj,Slovenia

We would not be able to help if we do not know what is the problem.
Please write down the problem in detail.

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razvan5050
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Reply #2 on: October 09, 2011, 07:27:02 pm » posted from:Bucharest,Bucuresti,Romania

I've simplified it a bit...

I just need to figure out where are the objects if they form the following virtual images and the rays that form them


* 1.JPG (6.51 KB, 512x384 - viewed 289 times.)

* 2.JPG (6.44 KB, 512x384 - viewed 291 times.)

* 3.JPG (6.61 KB, 512x384 - viewed 305 times.)
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lookang
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Reply #3 on: October 09, 2011, 09:51:12 pm » posted from:SINGAPORE,SINGAPORE,SINGAPORE

one assumption i made is the symbol is a diverging lens
http://budiprasetyoutomo.blogspot.com/2010/04/diverging-lens.html

if this assumption is valid, then
maybe u can explore this http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=1155.0
and find out yourself.

picture 1 seems possible, u know where? appears to me to be at F on the right

pictue 2 seems to require the object to be an infinity on the right side

picture 3 i cant get it, is it a trick question?


* lensdiverging.png (14.93 KB, 600x553 - viewed 426 times.)
« Last Edit: October 09, 2011, 09:53:11 pm by lookang » Logged
razvan5050
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Reply #4 on: October 10, 2011, 04:45:21 pm » posted from:Bucharest,Bucuresti,Romania

First of all. The arrows I drew in the pictures are virtual objects, not virtual images, as I first said. Sorry!

Yes it's a diverging lens. I tried the same app and it just doesn't seem right. The thing is that the app doesn't know what happens when you move the object past the lens, when it becomes virtual. That's what I think. If you look at the red ray it goes to the left, when light only goes to the right...

It looks like a mirror image of the diagram when the object is placed in front of the lens. Just move the object back and forth and see. It's the exact mirror image.

Anyway this kind of ray diagrams are better drawn on paper. I just can't get it...
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Fu-Kwun Hwang
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Reply #5 on: October 10, 2011, 06:23:51 pm » posted from:Idrija,Bohinj,Slovenia

You are welcomed to check out Thin Lens (converging/diverging lens/mirrors)
You should be able to try all possible configuration with the above simulation.
Wish you luck!
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