Thin Lens (converging/diverging lens/mirrors)

Fu-Kwun Hwang

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1 Thin Lens (converging/diverging lens/mirrors)

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on: January 29, 2004, 11:02:28 pm » posted from:,,Satellite Provider

Registed user can get files related to this applet for offline access.
Problem viewing java?Add http://www.phy.ntnu.edu.tw/ to exception site list
If java program did not show up, please download and install latest Java RUN TIME

There are 46 translations,
Higher number at the end means more translation been done.

Equation for thin lens: $\frac{1}{p}+\frac{1}{q}=\frac{1}{f}$ where p is the distance between object and lens, q is the distance between image and lens, and f is the focus length of lens.

blue lines	trace of light path
green lines	backward tracing for virtual image
small red lines	distances f and 2*f away from the center of lens.
1st textfield	current mouse position (x , y) relative to lens
white vertical line	reference line (you can click and drag it left/right)
yellow line	light path for paraxial ray assumption(mirror only)

Parameters can be changed :

Select Lens for thin lens effect(default)

select mirror for concave/convex mirror effect

default: assume paraxial ray (you can turn it off)

press toggle button +/- to change between converging/diverginglens

Move the object

click near tip of the object, and drag it to where you like it and release the mouse button.

Move the lens/mirror:

click near center of the lens, and drag it to left or right.

if click with left mouse button, only lens will move.

if click with right mouse button, object will move with lens.

Change the focus length of the lens/mirror

click near the top/bottom of the lens/mirrir, then drag the mouse . Try it!

if you adjust the size of window, parameters reset to default values.

you can open more then one window to compare different cases, close the created window to Quit. Pressto open another Lens window!

you can change the following parameters inside the "textfield".

Parameters	distance	defaults
P	object	20.
q	image	20.
f	focus	10.
m=-q/p	magnification	1.

Relation 1/p+1/q=1/f

What will happened if part of the light path were blocked

You are welcomed to check out a wonderful thin Len flash animation created by a teacher in Taiwan

http://www.youtube.com/watch?v=E2EmowDS0U4

http://www.youtube.com/watch?v=HIZiiqGcwCc

http://www.youtube.com/watch?v=brTzn9VoGks

http://www.youtube.com/watch?v=PlG6ps3i9bo

There are 46 translations,
Higher number at the end means more translation been done.

ThinLens.gif (654.03 KB, 640x480 - viewed 124348 times.)
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Reply #1 on: January 30, 2004, 08:02:46 am » posted from:,,Satellite Provider

Subject: Lenses
Date: Sun, 01 Feb 1998 17:08:13 -0600
From: John Eagle <jwe392@mail.usask.ca>
To: hwang@phy03.phy.ntnu.edu.tw
I think this page is great.
I stumbled into it one night while trying to find some insight on a physics assignment that I had.
I've used it ever since to check my work.
Something that might be helpful to a great number of people
would be a java applet with thick lenses and or two lense systems. Just a thought.
Thank you for taking the time to publish such a page John Eagle


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Reply #2 on: January 30, 2004, 08:11:28 am » posted from:,,Satellite Provider

Subject: Lens/mirror
Date: Fri, 03 Apr 1998 16:16:37 -0600
From: Kelly <kpuls@students.wisc.edu>
To: hwang@phy03.phy.ntnu.edu.tw
Mr. Hwang, I want to say that your virtual lab was unbelievably helpful to me.
I attend the university of wisconsin-madison and I was having problems with optics concepts.
I went under the internet and searched under lens and mirrors and fell upon your lab.
I am very grateful. I was a little upset last night when I wanted to access the lens mirror applet,
because I couldn't find it.
I guess even the virtual labs have hours of availability.
I guess that's my only suggestion,
which isn't a very necessary one to attend to when most of us can access it during the day.
Thanks again, Chris cechapma@students.wisc.edu


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Reply #3 on: January 30, 2004, 10:58:55 am » posted from:,,Satellite Provider

Subject: Wow!!!
Date: Sun, 03 May 1998 15:39:11 -0600
From: The Lahrs
To: hwang@phy03.phy.ntnu.edu.tw
I just figured out that the inverted image is not virtual but real,
so everything makes sense now.
Keep up the good work.
John C. Lahr


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Reply #4 on: January 30, 2004, 10:59:36 am » posted from:,,Satellite Provider

Subject: Wow!!!
Date: Sun, 03 May 1998 12:47:55 -0600
From: The Lahrs
To: hwang@phy03.phy.ntnu.edu.tw
I love your thin lens page: http://www.phy.nau.edu/~layton/JavaApps/thinlens/lens_e.htm
What a great use of Java!
I use Netscape, by the way, and the applet worked just fine and was very speedy.
I've been trying to figure out why a glass rod creates an inverted (about one axis) virtual image.
Do you have an applet for a thick lens, or just a ray diagram that would show this effect?
Is the thinlens.java code still available? The link was not working when I tried.
It would be interesting to develop something like this for seismic waves.
I'm a seismologist now, but my first love is physics,
which was my undergraduate major at Rensselaer Polytechnic Institute.
Thanks again for providing the world this great applet.
John C. Lahr
-- * John C. and Jan H. Lahr * *
914 10th Street * *
Golden, Colorado 80401 * *
(303) 215-9913 * *
http://www.lahr.org/john-jan * *
http://giseis.alaska.edu/lahr *


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Reply #5 on: January 30, 2004, 11:33:55 am » posted from:,,Satellite Provider

Subject: Thin Lens Java applet
Date: Fri, 19 Feb 1999 18:00:24 +1100
From: pevans@mentone.gsat.edu.au
To: hwang@phy03.phy.ntnu.edu.tw
Hi

I was looking at your applet for the thin lens and really liked it. I am new to applets and
often it is possible to download them so that you can use them off line but I couldn't
work out what to do to download your applet.

I am a secondary teacher and would really like to show it to my students. Would I be
able to get a copy of it please.

Thanks

Pam Evans
pev@netspace.net.au
pevans@mentone.gsat.edu.au


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Reply #6 on: January 30, 2004, 04:42:18 pm » posted from:Taipei,T'ai-pei,Taiwan

From: Rick Matthews <matthews@wfu.edu>
Organization: Wake Forest University
To: hwang@phy03.phy.ntnu.edu.tw
Subject: Great applet!

I just discovered your lens applet. It is a great tool for
helping students come to understand lenses and mirrors.

Unless you object, I would like to assign a problem to my
students based on this applet.

--
Rick Matthews matthews@wfu.edu
Department of Physics http://www.wfu.edu/~matthews
Wake Forest University 336-758-5340 (Voice)
Winston-Salem, NC 27109-7507 336-758-6142 (FAX)
USA


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8 Thin lens

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Reply #7 on: May 25, 2004, 02:08:12 am » posted from:Fond Du Lac,Wisconsin,United States

This is an awesome lab for teaching ray diagrams and optics basics! Thanks a bunch!


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Reply #8 on: August 13, 2004, 04:14:50 pm »

lixo


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Reply #9 on: August 13, 2004, 04:29:52 pm »

:shock: :shock: :shock: :shock: :shock:


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11 fuk off

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Reply #10 on: August 13, 2004, 08:08:45 pm »

sup dude, yo this Thin Lens Demostration stuff rock!! i really enjoied it!! ill write a song now, c ya!

"go go go go go Go shory it's your birthday you gonna party like it's your birthday" by 50 cent

um abraço pra galera do marista

:lol:


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12 Class

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Reply #11 on: August 18, 2004, 09:01:05 pm »

:arrow: This is an [b:134dfe8f92]amazing[/b:134dfe8f92] site man! very interesting to study lens and mirrors!! Tongue

Now i can figure out how does it work! Wink

As soon as you have news i'll be back! Se ya!!!


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13 Ohhh povo feio

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Reply #12 on: August 18, 2004, 09:07:28 pm »

[b:73495ba837] Hadson é lindo!!!!!![/b:73495ba837], mas Enzo é muito chato e muito burro!! Klebinho é pegador!!!!!!!! Saulo parece c Silvio Santos, mas se acha muito!!!!!!!! Seus feios!!!
Gabarito de Matematica:
1- a)
2- b)


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Reply #13 on: February 24, 2005, 07:16:57 pm »

I have few stupid questions...

I see mainly converging lenses collecting rays to one poit (pix A) but do they work another direction? (pix B) any differet solutions/ something usefull to know? I know I could use image conduit but they don't have enought resolution for 2000-3000 pixel CCD-bar/21mm wide...or I'm wrong? :?: In pictures arrow shows direction of ray.

Another Q is about focusing. Is there difference in working of D ja C assebly pictures? Are they equal?


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aauba

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Reply #14 on: February 25, 2005, 02:28:10 am »

i am very glad to see the applets, i would like see more of them Cheesy


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asdf

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16 thin lense

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Reply #15 on: April 19, 2005, 02:05:24 am »

This thin lense program is awesome! How Long did it take you to make it?


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Fu-Kwun Hwang

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Reply #16 on: April 19, 2005, 02:36:42 pm »

[quote:f1f6840cd2]i am very glad to see the applets, i would like see more of them [/quote:f1f6840cd2]

You can try out the following applet!

http://www.phy.ntnu.edu.tw/ntnujava/viewtopic.php?t=174

:-)


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mustafadmrc

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Reply #17 on: May 26, 2005, 04:48:34 am »

Students won't be alfraid of physics with the help of these java applets. All physics teachers must use java applets. These are very useful Thanks for sending us for free. Tongue


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Fu-Kwun Hwang

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Reply #18 on: May 26, 2005, 12:12:10 pm » posted from:Taipei,T'ai-pei,Taiwan

[quote:506d759f5b]I see mainly converging lenses collecting rays to one poit (pix A) but do they work another direction? (pix B) any differet solutions/ something usefull to know? I know I could use image conduit but they don't have enought resolution for 2000-3000 pixel CCD-bar/21mm wide...or I'm wrong? In pictures arrow shows direction of ray. [/quote:506d759f5b]
Yes. The path of light ray is reversable. If those parallel light really focus on one single point. You can place a light source at that point can create a parallel light output.


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tulu

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20 Not able to download applet

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Reply #19 on: November 23, 2005, 10:44:28 am »

I am not able to download the applet for offline use. When I press the "Get applets for offline use" button, I get a "no privilege" message in the next page.
Please help.


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colos

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Reply #20 on: November 25, 2005, 12:00:28 pm » posted from:Taipei,T'ai-pei,Taiwan

When I check it with my browser with two different account.
It works fines with my netscape and IE browser.
Could you tell me what is your browser and the verson #?
We have many downloads per days without such problems.


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Reply #21 on: February 20, 2006, 02:41:39 pm »

I am a new memeber. I have downloaded an applet, unfortunatley it is not working offline despite I have the version of JRE.


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Fu-Kwun Hwang

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Reply #22 on: February 20, 2006, 03:58:53 pm » posted from:Taipei,T'ai-pei,Taiwan

This applet was created with JDK1.0.2.
It should works for most of the browser.
You need to open lens_e.html with your browser.

If it still did not work. I need the error message from java console.


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thaddeusward

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24 Opening up the files in EJS program

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Reply #23 on: March 01, 2006, 10:55:18 am »

Professor Hwang,

This app is great. I would like to build off of your code to do a mirror simulation focused on some different ideas, but I don't can't get the app to open in the EJS interface so I can work on it. Is there a way to do this?

Thanks,

-TW


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Fu-Kwun Hwang

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Reply #24 on: March 02, 2006, 10:24:07 am » posted from:Taipei,T'ai-pei,Taiwan

Applets under physics simulation category are created many years ago with JDK 1.0.2

Only those applets under "Easy Java SImulation" category are created with ejs.
And you can view how it was created.

I am going to change the code and the server structure so that user can also edit ejs code and save the modified simulation on our server . (user also can get modified ejs code and all related files in ZIP format).


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Reply #25 on: April 05, 2006, 09:58:13 am »

This is absolutly spiffingly amazing! Cheesy

It reminds me of things that are good!
This is very good program it is good. Not bad.
I is a Student at Taira High School in Japan. Arigatoo my freinds.
Gomibako ni sunde imasu.
Neko o tabemasu ka?
Thanks you my freinds
Munko? :twisted:


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sanjeevgogna

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Reply #26 on: May 17, 2006, 04:47:42 am »

i am unable to download the source files it says no priveledge, my email is dreamsolutions@gmail.com, please help and advice, warm regards: sanjeev


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Fu-Kwun Hwang

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Reply #27 on: May 17, 2006, 08:57:17 am »

Please try it again! It should work now.


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normariam

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Reply #28 on: January 26, 2007, 10:03:31 am »

i think this simulation is just great and i hope every student will be more understand


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hak7011

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30 Re: Thin Lens (converging/diverging lens/mirrors)

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Reply #29 on: September 07, 2007, 01:34:31 pm » posted from:Falkenberg,Hallands Lan,Sweden

Is it possible to run the java script offline?

I can't find Lens.html after I have unzip the files...


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"That their main business was not put into the mind knowledge which was not there before, but to turn the mind's eye towards light so that it might see for itself." ...Plato's advice to educators(429-347BC)

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