How to visualize an electyromagnetic (light) wave

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    Light Wave
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Discussion Overview

The discussion revolves around visualizing electromagnetic (light) waves, specifically focusing on the dynamic representation of their properties as they travel through space. Participants express interest in animations that depict the interaction between the electric and magnetic components of the wave, particularly in the context of circular polarization.

Discussion Character

  • Exploratory, Technical explanation

Main Points Raised

  • One participant requests a video or applet that accurately represents the passage of an electromagnetic wave, emphasizing the desire to visualize the spiral motion of the wave.
  • Another participant suggests searching for "electromagnetic wave applet" and provides a link to an animation of a circularly polarized electromagnetic wave.
  • A participant expresses gratitude for the suggested applet and seeks clarification on the shape change of the wave as it passes through a polarizer, indicating a desire for deeper understanding.
  • In response, another participant explains that the wave changes from circularly polarized to linearly polarized after passing through the polarizer, noting that only the component of the electric field parallel to the polarization axis can pass through.
  • The original requester acknowledges the explanation and indicates a clearer understanding of the concept.

Areas of Agreement / Disagreement

Participants generally agree on the functionality of the applet and the behavior of the wave as it interacts with the polarizer, but the discussion does not explore any competing views or unresolved questions beyond the initial request for visualization.

Contextual Notes

The discussion does not address potential limitations of the applet or assumptions about the viewer's prior knowledge of polarization and wave behavior.

Who May Find This Useful

Individuals interested in visualizing electromagnetic waves, particularly in the context of polarization and wave dynamics, may find this discussion relevant.

Coronado
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Could someone please point me to a 'flash' or 'Java' type video that would accurately represent the passage of an electromagnetic (light) wave as it travels through space. I am particularly interested in being able to visualize the 'spiral' motion of the wave as the 'electro' and 'magneto' aspects of the wave interact. The imagery that I have seen so far gives only a more or less 'static' view of things, even when the objects represented are in motion, with the electric part and the magnetic part merely 'flip flopping' along through space.
Thank you ......PD
 
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Doc Al...thank you. That's about the best I have seen so for. I wonder if you can answer something for me. In the circularly polarized applet I click and drag to change the angle of view and I see a yellow plane (at the halfway point) through which the wave is traveling. As it does so the wave itself changes shape slightly as its passing through the plane. Could you explain that for me? Thx PD
 


I suspect you are looking at the applet titled "Circular wave with polarizer". That yellow plane represent the polarizer. The wave most definitely changes shape after passing through the polarizer: It starts out circularly polarized and becomes linearly polarized. Only the component of the E field parallel to the axis of polarization can pass through the polarizer.
 
Ohhhhhhhhhh I see....thank you very much. I now have a much clearer understanding...PD
 

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