Author Topic: Thin Lens (converging/diverging lens/mirrors)  (Read 1143555 times)

awzh08@xtreme4.pipex.net

  • Newbie
  • Posts: -1
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #45 on: September 06, 2008, 04:45:31 am »
 :) :) ;) :D ;D

leeyiren

  • Jr. Member
  • **
  • Posts: 39
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #46 on: December 31, 2009, 12:48:27 am »
Profeesor firstly i downloaded this zipped file, inside dun even have 1 executable jar file. I cannot do anything with it.

secondly, may i know why does the light passing through the optical centre of the lens not get refracted? as in the one passing diagonally. we always draw a straight line. It should have a double refraction or else it is inaccurate for a ray diagram.

Fu-Kwun Hwang

  • Administrator
  • Hero Member
  • *****
  • Posts: 3062
    • Enjoy the fun of physics with simulations
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #47 on: January 01, 2010, 12:20:14 am »
There are two different download simulations in this forum:
1. Under JDK1.0.2 simulations (1996-2001): Those simulations are created before 2001. The download ZIP file contain java class file and html files. You need to unzip the file and view the html file (normally, xxx.html where xxx is the same as the downloaded zip file.
2. EJS simulatoions: Those are simulations created with EJS. The download file is a jar file. You can dooble click the jar file to run it. You can open it with EJS when right click the mouse button and select open ejs model option. There are many other options.

The above message are include in the email message you received when you request our server sent you file.

The simulation for this topic is a thin lens. It means that the width of the lens is ignored and approximation has been made. That is why you did not find double refraction for a ray pass through the center. You can find more accurate rar tracing from simulations for thick lens .

abd

  • Newbie
  • *
  • Posts: 1
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #48 on: April 24, 2010, 08:15:47 pm »
[i want to save this simulation
how?

Fu-Kwun Hwang

  • Administrator
  • Hero Member
  • *****
  • Posts: 3062
    • Enjoy the fun of physics with simulations
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #49 on: April 25, 2010, 12:45:05 am »
Click "get file for offline use" button at the first mesage (where you find the simulation).

tladewski

  • Newbie
  • *
  • Posts: 1
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #50 on: June 11, 2011, 08:48:02 am »
Hi!  Thanks for the great website!

I think I'm not understanding the download procedure for the Thin Lens simulation, because I didn't find a jar file in the download I requested.

The post I read says there are two different downloads, but when I downloaded the files, I only got html files, with some gif, class, and java files.  What should I be doing to get the jar file?

Thanks again for the great work!

Fu-Kwun Hwang

  • Administrator
  • Hero Member
  • *****
  • Posts: 3062
    • Enjoy the fun of physics with simulations
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #51 on: June 11, 2011, 04:19:01 pm »
There are two different type of downloaded simulations:
1. ZIP file: This is for simulations created before 2001 using JDK1.0.2: You should unzip the file and open index.html with your browser. (There is no jar file, but class files. )
2. JAR file: This is for simulations created after 2001 using EJS.
You can double click jar file to run it locally.

You will get the instruction if you ask our server to send file to your email account (first option).
There is no information if you download it directly (second option).

Mio-Gonzalez

  • Newbie
  • *
  • Posts: 2
    • bike parts
Re: topic48
« Reply #52 on: September 06, 2011, 04:18:13 pm »
[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. Greetings, Max,-*-
Quite interesting question. Does anybody know?

Mio-Gonzalez

  • Newbie
  • *
  • Posts: 2
    • bike parts
Re: topic48
« Reply #53 on: October 05, 2011, 04:33:15 am »
bikeparts
[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. Greetings, Max,-*-
Quite interesting question. Does anybody know?

hmmmm :-/
« Last Edit: October 05, 2011, 04:35:56 am by Mio-Gonzalez »

Fu-Kwun Hwang

  • Administrator
  • Hero Member
  • *****
  • Posts: 3062
    • Enjoy the fun of physics with simulations
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #54 on: March 08, 2012, 05:39:20 pm »
Quote
My name is Azhar and i am a big fan of your applets and i use it quite a bit in class to teach my classes.

Recently, I was using the thin lens demonstration and i noticed that as i brought the object from distance further away from 1 focal length to exactly to the focal length (object distance = focal length). The light rays go to infinity as expected.

However, as we bring the object from distance less than 1 focal length to exactly one focal length, light rays are shown to come out in the direction of the object, which indicates that there might be a virtual image formed somewhere far  far away.

I genuinely want to know which situation is really true.

This above is an email message I received today.
Light ray goes to infinity when the object is placed at the focus point. i.e. object distance=focus length.
When the object distance is less than focus length(no matter how small the difference might be), it will form virtual image.
When the object distance is more than focus length(no matter how small the difference might be), it will form real image.

From mathematic point of view or with the simulation, we can set object distance=focus length.
However, it is not possible to do so in real life. Because object has finite width and measurement always has finite error.

The simulation was designed so that some student might raise question and think about what really happened.

The purpose of my simulation is not to provide answer to the question student might have, but to provide opportunity for students to think about related physics.

I would suggest you to ask student discuss : is it possible to set object distance = focus length in real life?
Object has finite width. What will be seen when the center of mass of the object is placed at the focus point.
Part of the object distance is less than focus length and part of the object distance is larger than the focus length.

Provide opportunity for student to think is more important than provide answer to the student! :-)

melnik

  • Newbie
  • *
  • Posts: 1
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #55 on: March 14, 2012, 05:52:04 am »
could you please tell me why I am experiencing problems with downloading it now??? Thanks a lot

-*-

Fu-Kwun Hwang

  • Administrator
  • Hero Member
  • *****
  • Posts: 3062
    • Enjoy the fun of physics with simulations
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #56 on: March 14, 2012, 09:24:21 am »
I just download it again without any problem. Please try it again or use another browser.

koclup1580

  • Newbie
  • Posts: -16
    • ????????????
Re: Thin Lens (converging/diverging lens/mirrors)
« Reply #57 on: December 29, 2012, 02:22:05 pm »
thank you so much.