Can You See a Photon Beam Between Two Reflective Surfaces?

AI Thread Summary
In a scenario with two 100% efficient reflective surfaces positioned parallel to each other, a photon beam at a 90° angle of incidence would theoretically remain stable without interaction. However, visibility of this beam is questioned, particularly when it travels perpendicularly to the observer's line of sight. The consensus is that one would not be able to see the beam, as it would be effectively transparent in this configuration. Therefore, despite the beam's existence, it would not be visible to the observer. The conclusion is that the beam cannot be seen under these specific conditions.
Raiden60
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Let's say you have 2 100% efficient reflective surfaces exactly parallel to each other. If you theoretically managed to place photons at exactly 90° angle of incidence. So this beam of visible light (and I want to stress that) is going to stay there as long as there is no interaction, the beam will stay there, right? What I want to know is if you could see this beam. If it exactly perpendicular to the reflective surfaces, and the light is only traveling on the sagittal plane relative to you, would you even be able to see it? Or could you see right through it?
 
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Raiden60 said:
would you even be able to see it?
No.
 
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