Author Topic: Reflection/Refraction  (Read 426809 times)

Fu-Kwun Hwang

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Reflection/Refraction
« on: January 30, 2004, 12:08:35 am »
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


This java applet shows the physics behind a beam of light impinging at some angle
    on the smooth/rough surface. (reflection/ total internal reflection/diffuse reflection and refraction)


The java applet was divided into two region lower half (water) and upper half (air).

Click links to switch: between water-air and air-water cases



Usage: You will find a flashlight under the water surface. (Picture)
    Click the blue region and drag the mouse button to move the flashlight.
    Click the green region and drag the mouse button to change the direction of the flashlight.
    Some of the light were reflected back to the water,
      and some of the light beam change their direction (refracted) into the air.

    When the angle is large enough, the refraction beams vanished ( Total internal reflection).


    Click the blue region twice, and the flashlight will turn into a laser pointer.


    You can move or change direction of the the laser point with similar way as metioned above.

    In laser pointer mode: click the water/air interface will change the property of the interface.
      Toggle between flat surface/rough surface.

    In rough surface mode: watch the diffuse reflection.

    In flat surface mode: a circle will be shown while drag the mouse button.

    • the length of yellow bar = the length of orange bar => law of reflection
    • The length of red bar/the length of yellow bar = constant (index of refraction) => law of refraction (Snell's law).


    Click the blue region of laser point to change back to flashlight mode.

    Enjoy/Play the java applet and learn the physics behind it!


Another similar applet can be found at Intensity of reflected s-wave/p-wave

Check out the following URL if you are interested in Guide To Choosing A Personal Flashlight.


http://www.youtube.com/watch?v=mcOCrPCbyq4

http://www.youtube.com/watch?v=9SMEf8nHTjI


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

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topic49
« Reply #1 on: January 30, 2004, 11:56:17 am »
Subject: Refraction Applet
Date: Thu, 23 Apr 1998 10:14:02 -0400
From: Sandee Coats-Haan <LA_COATSHAA@PO.SWOCA.OHIO.GOV>
To: hwang <hwang@phy03.phy.ntnu.edu.tw>
Is there any way to change the velocity vector and/or the medium thickness
on your refraction applet if you don't have a two button mouse?
Sandee (Lakota East High School Physics)
P.S. -- you have an incredible site

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topic49
« Reply #2 on: January 30, 2004, 11:57:54 am »
Subject: (no subject)
Date: Wed, 29 Apr 1998 22:13:08 -0500
From: Dion Sanchez <dion@insync.net>
To: hwang@phy03.phy.ntnu.edu.tw
I want to thank you for this page, it has helped me visualize what a text book could not.
I have been looking for something like this for a long time.
great stuff thanks. dion

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topic49
« Reply #3 on: January 30, 2004, 12:25:17 pm »
Subject: Physics of Light
Date: Tue, 5 Jan 1999 21:13:57 -0400
From: "Reg & Lori Coppicus" <reg.lori.coppicus@ns.sympatico.ca>
To: <hwang@phy03.phy.ntnu.edu.tw>
Sir;
  Enjoyed very much the physics of light showing internal reflection, and
diffusion of the laser.
I look forward to examining more related Java applications, but a very good
presentation.

Reg Coppicus
Nova Scotia, Canada

  • Guest
topic49
« Reply #4 on: January 30, 2004, 01:45:31 pm »
Subject: online interactive site
Date: Wed, 18 Aug 1999 11:11:06 -0400
From: RAYC1@ten-nash.ten.k12.ten.us
To: hwang@phy03.phy.ntnu.edu.tw
WOW!!!!!! Reflection and Refraction is WONDERFUL!!!!THANK YOU

Leslie Marra

lmarra@excite.com

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Thanks
« Reply #5 on: May 28, 2004, 09:58:28 am »
The, "Thin Lens & Mirror Demonstration," applet really helped me in my Physics studies. Thank You so much!

cerysdad

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topic49
« Reply #6 on: March 01, 2005, 05:30:28 am »
Excellent thank you ! Very useful.

aone_off

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topic49
« Reply #7 on: March 15, 2005, 07:35:26 am »
hi plz can i get the source file of this skill plz send it to my mail box
thanks a lot :)

oracledeepakinfo

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physics
« Reply #8 on: July 31, 2005, 05:49:48 pm »
i want to make a wesite of the physics based on x xi xii class label.i have need cd and study material if u have then please try to mail or send me thats i can give in india powerfull.
  deepak kumar
  236,Triveni appt.jhilmil colony new delhi india-1100095
  ph.no:-+91-11-22158693,9312271784

jpellice

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Java compatibility
« Reply #9 on: September 13, 2005, 05:17:55 pm »
First of all thank you very much for your nice applet.

I had a problem to run the applet offline. May be the solution I found is useful to some people.

I think I had a compatibility problem with Java from Sun microsistems. I had to manually disable the Sun Java Console in the Internet Explorer. This can be done at Tools->Options-Advanced->Java > (Sun).

I am not familiar to Java. May be some one can shed more light to this type of problems.

Best regards,

Julio Pellicer
Spain

Rodrigo Munoz

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I can't see the applet
« Reply #10 on: October 15, 2005, 11:31:48 am »
Hi,
I have windows 98, and I see the applet Reflection/Refraction on line, but the files you sent me don't show the applet

Fu-Kwun Hwang

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topic49
« Reply #11 on: October 18, 2005, 09:53:38 am »
I just download the file and view it. It seems works fine with my computer.
Please open the java console and tell me what is the error message!

Another similar applet with more options can be found at Intensity of reflected s-wave/p-wave

bülent

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Re: Reflection/Refraction
« Reply #12 on: April 01, 2007, 06:56:11 pm »
thank you very much. these applets are very usefull.

valteruks

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Re: Reflection/Refraction
« Reply #13 on: April 23, 2008, 04:16:42 am »
Hello sir,

I am very interested in your applets, besides i am from Lithuania :) But i have very big question, i think this applet shows wrong angles, is any chances that you could fix it? I don't think that the angle can be more than 90 degree, and it shows more than 100.

Thanks

Fu-Kwun Hwang

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Re: Reflection/Refraction
« Reply #14 on: April 23, 2008, 02:00:09 pm »
The values shown are horizontal distance(not angle).
The ratio of those two distance is equal the ratio of refraction index for those two regions!