NTNUJAVA Virtual Physics Laboratory
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Author Topic: Shadow/Image and Color  (Read 169445 times)
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Fu-Kwun Hwang
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on: January 29, 2004, 10:25:22 pm » posted from:,,Satellite Provider

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A thin beam of light is often called a ray.
When we stand in the sunlight, some of the light is stopped while other rays pass on in a straight-line path.
A shadow is formed where light ray can not reached.
This java applet let you play with shadow and image.
To make it more fun, there are 3 different colors (Red/Green/Blue) light source.
You can also study the mixing of colored light.



Click different color checkbox to turn on that light source. (Default:Red light)
Click "show trace" button to display light paths.
There is a screen on the left. An object is located between light source and the screen.
    Left click the object and drag the mouse to move the object.
    Right click the object and drag it up/down to change the length of the object.
    If you click the mouse button twice continuously, it is toggle between an object or a slit.
    (Use similar method to change the width/location for the slit)

You can select point light source or rod shape light source from the list.
    1. Point source:
    Click the light source and drag it to different location.

2. Rod source:
    change its location:
      Click the left mouse button inside the region of the light source and drag it.

    change its length:
      Click the right mouse button inside the region of the light source and drag it down.

Have fun ! Play with it and try with different cases!


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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Reply #1 on: January 30, 2004, 11:14:53 am » posted from:,,Satellite Provider

Subject: java applet on shadow/image
Date: 15 Sep 1998 11:16:06 EDT
From: POWERS@pat-med.k12.ny.us
To: hwang@phy03.phy.ntnu.edu.tw
Dear Hwang,

Our fifth grade science teachers love your applet on color mixing and
images. Please feel free to create activities that are appropriate on
the elementary level.....they are highly needed and greatly appreciated
(especially on magnetism and electricity). Thanks again.

Sincerely,
Wendy Power
POWERS@pat-med.k12.ny.us
wpower1@ix.netcom.com
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Reply #2 on: January 30, 2004, 11:43:57 am » posted from:,,Satellite Provider

Subject: Color, light, and shadow.
Date: Mon, 12 Apr 1999 10:14:01 -0500
From: "John Clement" <clement@hal-pc.org>
To: <hwang@phy03.phy.ntnu.edu.tw>
An applet that would be invaluable in teaching how light and color work
would be one that had a flashlight with different color filters red, green,
blue, cyan, magenta, yellow, clear. Then the user could view various
objects in those same colors using the flashlight. This would be an
illustration of how "classical" color reflection works.
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Reply #3 on: January 30, 2004, 12:46:04 pm » posted from:,,Satellite Provider

Subject: mixing light-beam
Date: Sat, 21 Aug 1999 06:44:04 +0700
From: amrat chawla <amratc@inet.co.th>
To: hwang@phy03.phy.ntnu.edu.tw
Dear Sir,
Your mixing light beam applet is very very instructive. When I show to
my children they were amazed and understand easily of what they learned
at school but never get it clear. You know how schooling in Thailand,
education here is mostly memorising and answer question ! So we parent
have to help our children understand by external help. Your applest is
very helpful tool.

Thankyou for your contribution to people of the world.
With best rgds.
Amrat Chawla.
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chupkor123
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Reply #4 on: November 11, 2010, 04:18:07 pm » posted from:Shanghai,Shanghai,China

nice!
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eomlk520
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Reply #5 on: December 02, 2011, 03:15:37 pm » posted from:,,Satellite Provider

up

 Smiley Smiley Smiley Smiley Smiley

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tookkatababi
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Reply #6 on: September 29, 2012, 12:49:16 pm » posted from:Bangkok,Krung Thep,Thailand

 Cheesy Cheesy Cheesy
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