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"Progress, therfore, is not and accident,¡K" ..."Herbert Spencer(1820-1903, British philosopher)"
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Author Topic: Thick Lens  (Read 76265 times)
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Fu-Kwun Hwang
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on: January 29, 2004, 10:51:12 pm » posted from:,,Satellite Provider

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When a beam of light meet the boundary between two different media,
    some light is reflected back to the same media
      (law of reflection)

    some light is refracted to a different media
      ( law of refraction).


The same laws applied when light wave impinging the surface of a lens.
This java applet let you play with a thick lens.



How to play:
    You can enter the index of refraction of the lens into the Text Field.

    The gray ellipse area represents the thick lens.
    You can click the left mouse button within one of four cyan circle around the lens
      and drag the mouse button to change the shape of the lens.

    You can click the circle at the center of the ellipse and drag the mouse left/right to move the lens horizontally.
    Light beam entering from the left of the screen.

    You can click at the beam and drag it up/down. Hit Reset button for default conditions.




Approximate indices of refraction of various substance
Air1.00029
ice1.31
water1.333
Ethyl alcohol1.36
Fused quartz SiO21.4584
glass1.5 - 1.6
diamond2.417
Futile TiO22.907
Gallium phosphide3.50



http://www.youtube.com/watch?v=EXmaY2txEBo


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*** There are 1 more attached files. You need to login to acces it!
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PELADO
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Reply #1 on: May 17, 2008, 11:03:16 pm »

OK  Grin
TKS FOR ALL YOU ARE A GENIUS
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Wieslaw
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Reply #2 on: August 08, 2009, 01:38:31 am » posted from:Warsaw,Mazowieckie,Poland

It is really nice, however I would like to suggest making another similar applet, a little more complicated. It could show the rays in a human eye. There just should be some procedures used here repeated more times.
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Wieslaw Kruczala
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Reply #3 on: December 31, 2009, 04:31:25 am »

prof, am i right to say that this simulation is to show us that the thicker the lens, the shorter the focal length?
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leeyiren
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Reply #4 on: December 31, 2009, 04:45:00 am »

can anyone briefly tell me what is the equation in the simulation?
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Fu-Kwun Hwang
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Reply #5 on: December 31, 2009, 12:45:50 pm » posted from:Taipei,T'ai-pei,Taiwan

Refraction obey Snell's Law n_1\sin\theta_1=n_2\sin\theta_2
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leeyiren
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Reply #6 on: December 31, 2009, 07:39:10 pm »

Refraction obey Snell's Law n_1\sin\theta_1=n_2\sin\theta_2

what i mean is the equation "x^2/n+y^2/n=1"

i dun see the snell's law in it?
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Fu-Kwun Hwang
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Reply #7 on: December 31, 2009, 11:09:08 pm » posted from:Taipei,T\'ai-pei,Taiwan

math_failure (math_image_error): \frac{x^2}{a^2}+\frac{y^2}{b^2}=1 is the equation for the shape of the lens (equestion of Ellipse).
Snell's law is used to calculate the ray refraction when light enter into lens and get out of the lens.
You should be able to find it in the code.

Quote
am i right to say that this simulation is to show us that the thicker the lens, the shorter the focal length?

Yes. The focal length getting shorter when lens is getting thicker.
When the lens is too thick or when the ray is too far from the axis, there might be a single focual point any more.
Please check out Lens (thick lens) and Mirror.
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"Progress, therfore, is not and accident,¡K" ..."Herbert Spencer(1820-1903, British philosopher)"
 
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