Do virtual photons explain this phenomenon?

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Discussion Overview

The discussion revolves around the nature of light, reflection, and the concept of virtual photons in relation to the Casimir effect. Participants explore questions about whether photons can "see" their reflections and the visibility of light paths in images of laser reflections.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants propose that the Casimir effect relates to the energy of the vacuum between and outside plates, suggesting a calculable difference in energy.
  • One participant questions if a photon can see its own reflection when approaching a mirror, leading to a discussion about the implications of massless travel at the speed of light.
  • There is a debate about the visibility of light paths in images, with some attributing the visibility to low intensity and others questioning the camera angle.
  • One participant suggests that virtual photons may explain certain phenomena, while others challenge this idea, asserting that classical optics sufficiently explains light reflection.
  • Several participants express confusion regarding the relationship between virtual photons and the observed phenomena, with some insisting that classical physics adequately describes the situation without invoking quantum effects.

Areas of Agreement / Disagreement

Participants express multiple competing views regarding the role of virtual photons and the adequacy of classical physics in explaining light reflection. The discussion remains unresolved, with no consensus on the necessity of invoking quantum concepts.

Contextual Notes

Some participants exhibit uncertainty about the implications of massless travel and the visibility of light paths, indicating a potential misunderstanding of classical versus quantum physics principles.

Prashan Shan
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ChrisVer said:
As for the casimir effect it exists because the "energy" of the vacuum you can have between the plates is infinite , but it's still less infinite than the energy of the vacuum you can have outside the plates. And this difference is calculable.
ChrisVer said:
As for the casimir effect it exists because the "energy" of the vacuum you can have between the plates is infinite , but it's still less infinite than the energy of the vacuum you can have outside the plates. And this difference is calculable.
ok.
this may sound stupid,
first of all i asked this question because i have a doubt that "if a photon can see things around it will it be able to see its own reflection if it aproaches towards a mirror?"
so i played a video of light being reflected in a mirror in slow motion and paused the video.
i saw that before the laser beam came out of the source, the light is reflected in the mirror.
so i thought it may be because of virtual photons.

First image:
1.PNG

Second image:
2.PNG
 
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Prashan Shan said:
i saw that before the laser beam came out of the source, the light is reflected in the mirror.

You saw what?
 
Prashan Shan said:
"if a photon can see things around it will it be able to see its own reflection if it aproaches towards a mirror?"

Also I want to understand what you meant with this... what do you mean by photon seeing things around it and seeing its own reflection?
 
ChrisVer said:
Also I want to understand what you meant with this... what do you mean by photon seeing things around it and seeing its own reflection?
if you have no mass and u are traveling in the speed of light towards a mirror will u see your image in the mirror?
 
Prashan Shan said:
if you have no mass and u are traveling in the speed of light towards a mirror will u see your image in the mirror?

I haven't thought about this scenario... I guess nope [because the light leaving from me towards the mirror is going to arrive there together with me]... not until I reached the mirror. But again the sentence doesn't really makes sense...
 
ChrisVer said:
I haven't thought about this scenario... I guess nope [because the light leaving from me towards the mirror is going to arrive there together with me]... not until I reached the mirror. But again the sentence doesn't really makes sense...
see the 2 images which i have uploaded. in the first image u can see a small green spot on the mirror, but why does the path of light is not visible
 
Prashan Shan said:
see the 2 images which i have uploaded. in the first image u can see a small green spot on the mirror, but why does the path of light is not visible

Because of its low intensity...Obviously there seems to be a beam visible (incoming and outgoing).
 
ChrisVer said:
Because of its low intensity...Obviously there seems to be a beam visible (incoming and outgoing).
in the 1st image if the intensity of the incident beam is low, then how does a small portion of reflected beam is visible near the mirror?
 
I guess it's the camera's angle...
 
  • #10
ChrisVer said:
I guess it's the camera's angle...
if it is because of camera's angle how it is visible in the 2nd image. the camera is in the same angle as it was before in the 1st image.
 
  • #11
Prashan Shan said:
if it is because of camera's angle how it is visible in the 2nd image. the camera is in the same angle as it was before in the 1st image.

The difference between pic1 and pic2, is the beam's intensity...
 
  • #12
ChrisVer said:
Because of its low intensity...Obviously there seems to be a beam visible (incoming and outgoing).
what if it is coming from opposite direction?
 
  • #13
Prashan Shan said:
what if it is coming from opposite direction?

how would it come from opposite direction?
 
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  • #14
it may be virtual photons...
the travel back in time, they travel FTL ...
 
  • #15
Prashan Shan said:
it may be virtual photons...

absolutely not... for what we have already mentioned...

Prashan Shan said:
the travel back in time, they travel FTL ...

FTL =?
again this makes no sense... it's obvious in both pics what is happening. And I wouldn't expect any quantum effect in this case (as far as you have a beam, it looks like it's mere optics).
 
  • #16
ChrisVer said:
absolutely not... for what we have already mentioned...
FTL =?
again this makes no sense... it's obvious in both pics what is happening. And I wouldn't expect any quantum effect in this case (as far as you have a beam, it looks like it's mere optics).
ChrisVer said:
absolutely not... for what we have already mentioned...
FTL =?
again this makes no sense... it's obvious in both pics what is happening. And I wouldn't expect any quantum effect in this case (as far as you have a beam, it looks like it's mere optics).
i can't understand.
 
  • #17
Prashan Shan said:
i can't understand.

by optics, I mean classical optics... what you can't understand?
 
  • #18
This has absolutely nothing to do with quantum physics. The reflection of light is perfectly well understood in classical physics and there is no need whatsoever to invoke photons to make this description.
 
  • #19
Prashan Shan said:
so i played a video of light being reflected in a mirror in slow motion and paused the video.
i saw that before the laser beam came out of the source, the light is reflected in the mirror.
so i thought it may be because of virtual photons.

You are incorrect. You cannot see the laser beam unless the light reflects off of something. The 'beam' you see in the air is just light from the laser scattering off of air molecules and dust. At no point do you see the reflection or scattering before the light leaves the laser, despite what you think the video shows.
 
  • #20
We can close this thread, as the original question has been answered several times over.
 

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