NTNUJAVA Virtual Physics Laboratory
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"Progress, therfore, is not and accident,¡K" ..."Herbert Spencer(1820-1903, British philosopher)"
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Author Topic: Find the image for an object in the water  (Read 6654 times)
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Fu-Kwun Hwang
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on: January 10, 2011, 08:54:51 pm » posted from:Taipei,T'ai-pei,Taiwan

Do you know what is the image you will find if you look down and watch the object?
When light goes through water or any vacuum other than air it bends. In water an object may seem larger and closer than what the object appears to be at the surface. This is called refraction: the bending of light when passing from one transparent material to another. The formula for refraction is described in Snell's Law. The equation for Snell's Law is n1sinθ1=n2sinθ2.  while θ1 is the angle between the ray and the normal in the first medium. θ2 is the angle between the ray and normal in the second medium. When a light bends through water the frequency stays the same while the wavelength varies causing the change in the direction of the ray, making the object appear closer and larger underwater.



The following simulation let you paly with the above case.
An image of eye represents your eye in the simulation, and there is a blue rectangle in the water.
Let us try to find the image for the yellow dot in the following simulation.

Click the play button, and there are many rays will emit from the yellow dot.
 There ray will be refracted when they pass water-air surface.
When the rays are all drawn, it will find the image (red dot) for the yellow dot.

You can drag the yellow to other position (within the blue rectangle) and click play again to find another image point.
The position of the rectangle or the eye can be changed with drag and drop, too!

The range for the emitter rays can be adjusted with those two sliders (ci=0, cf=\pi, default value).

You are welcomed to check out related simulation at An object under the water look differ! (Location and shape)

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Press the Alt key and the left mouse button to drag the applet off the browser and onto the desktop. This work is licensed under a Creative Commons Attribution 2.5 Taiwan License
  • Please feel free to post your ideas about how to use the simulation for better teaching and learning.
  • Post questions to be asked to help students to think, to explore.
  • Upload worksheets as attached files to share with more users.
Let's work together. We can help more users understand physics conceptually and enjoy the fun of learning physics!



* optics_lightpaths.jpg (48.11 KB, 652x339 - viewed 488 times.)

* N-2nd_med.jpg (68.7 KB, 300x400 - viewed 1112 times.)
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