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"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"
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NTNUJAVA Virtual Physics Laboratory
Enjoy the fun of physics with simulations!
Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/ > Easy Java Simulations (2001- ) > Optics > Ray tracing of image forms with one or two combined convex/concave lens
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Author Topic: Ray tracing of image forms with one or two combined convex/concave lens  (Read 20080 times)
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Fu-Kwun Hwang
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on: July 19, 2009, 05:10:49 pm » posted from:Taipei,T\'ai-pei,Taiwan
The following applet shows light paths for converging lens.
Initially, there is only one convex lens.
The blue arrow represents object and green arrow is the image.
You can drag objec position and change it's height (drag arrow tip), too.
Two small cyan dots represent focus points (d 8)rag it to change focus length of the lens).
Drag the center of the lens to change it's location. Drag top of the lens to change the height of the lens.
For the first lens: \tfrac{1}{P_1}+\tfrac{1}{q_1}=\tfrac{1}{f_1}

Click 2nd Lens to add another convex lens. You can study how light paths were refracted to form the image.
If the separation between two lens is d, and assume second lens is at the right side of the first lens.
Then, p_2=d-q_1 , and the images form can be found at \tfrac{1}{q_2}=\tfrac{1}{f_2}-\tfrac{1}{p_2}.

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* twolens.gif (6.78 KB, 641x311 - viewed 746 times.)
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lookang
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Reply #1 on: July 20, 2009, 07:51:10 am » posted from:Singapore,,Singapore
i like this simulation.
I was able to
1.study how the marginal lights rays are implemented.

next
i will try to implement many rays based on the marginal codes!

* len05.PNG (53.46 KB, 646x547 - viewed 3344 times.)
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lookang
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Reply #2 on: July 21, 2009, 09:55:22 am » posted from:SINGAPORE,SINGAPORE,SINGAPORE
\tfrac{1}{P_1}+\tfrac{1}{q_1}=\tfrac{1}{f_1}

how to write equations in this forum? it is cool but i dont think it is default in SMF right?
Code:
\tfrac{1}{P_1}+\tfrac{1}{q_1}=\tfrac{1}{f_1}
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Fu-Kwun Hwang
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Reply #3 on: July 22, 2009, 08:28:45 am » posted from:Taipei,T\'ai-pei,Taiwan
Type the following syntax to show the above equation:
$\frac{1}{p}+\frac{1}{q}=\frac{1}{f}$

Please check out http://en.wikipedia.org/wiki/Math_markup.
However, you need to add $ sign before and after the equation.
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lookang
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Reply #4 on: July 22, 2009, 11:54:28 am » posted from:Singapore,,Singapore
alpha

ok i understand how to do that is this forum, but i can't do the same for my own forum http://66.7.205.91/~lookangc/index.php?topic=1005.msg2003#msg2003

can explain what mods needs to be done?

i actually use α
Code:
[html]α[/html]
« Last Edit: July 22, 2009, 11:57:35 am by lookang » Logged
Fu-Kwun Hwang
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Reply #5 on: July 22, 2009, 10:38:57 pm » posted from:Taipei,T\'ai-pei,Taiwan
I use the math equation code from MediaWiki and add my own code to make it work in this forum.
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Reply #6 on: December 14, 2014, 06:14:37 pm » posted from:,,Satellite Provider
Just bookmarking first.
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"In theory, theory and practice are the same. In practice, they are not." ..."Albert Einstein (1879~1955, Mathematical physicist, Nobel Prize 1921-Physics)"
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