Why can light go through some matter but not other matter?

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    Light Matter
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Discussion Overview

The discussion revolves around the question of why light can pass through some materials while being blocked or reflected by others. Participants explore this concept primarily through the lens of light as an electromagnetic wave, with a focus on transparency, reflection, and refraction in various materials.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant requests an explanation of light as an electromagnetic wave rather than as photons, indicating a lack of understanding of the particle model.
  • Another participant shares a resource that discusses transparent and opaque materials in relation to electromagnetic waves.
  • There is a question about why light, which causes surface electrons to oscillate in transparent materials, does not reflect back to the observer's eyes, particularly in the case of air.
  • Responses suggest that reflection and refraction are how transparent materials can be seen, but there is confusion regarding the visibility of air.
  • One participant asserts that air can be seen, using the example of blowing bubbles underwater to illustrate visibility in a medium where air is present.

Areas of Agreement / Disagreement

Participants express differing views on the visibility of air, with some asserting it can be seen under certain conditions while others remain uncertain about this claim. The discussion does not reach a consensus on the visibility of air compared to other transparent materials.

Contextual Notes

Some participants express confusion about the concepts of reflection and refraction, particularly in relation to air, indicating a need for further clarification on these phenomena.

k9b4
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If possible, I would like an explanation that uses light as an electromagnetic wave, rather than a massless particle, because I don't understand photons. Thank you.
 
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davenn said:
Thanks, so an object is transparent if light causes electrons in the object to oscillate, all the way through, until the same frequency light is emitted out the other side?

If this is the case, consider the electrons right on the surface of the object on the side of the incoming light. The light is causing them to oscillate; why is light not also reflected back to my eyes, enabling me to see air or other transparent materials?
 
Bump

Still don't understand
 
k9b4 said:
consider the electrons right on the surface of the object on the side of the incoming light. The light is causing them to oscillate; why is light not also reflected back to my eyes, enabling me to see air or other transparent materials?
It is. That, and refraction, are how you can see glass or water or diamonds or other transparent materials.
 
DaleSpam said:
It is. That, and refraction, are how you can see glass or water or diamonds or other transparent materials.
But I can't see air. I understand how I can see diamonds and glass, but I don't understand how I can see air?
 
k9b4 said:
But I can't see air. I understand how I can see diamonds and glass, but I don't understand how I can see air?
Sure you can. Go underwater and blow bubbles. You will definitely be able to see air in the same way that you can see other transparent materials.
 
DaleSpam said:
Sure you can. Go underwater and blow bubbles. You will definitely be able to see air in the same way that you can see other transparent materials.
Good point. Thanks.
 

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