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Old Jan 23rd 2017, 01:03 AM   #1
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Light through vaccuum?

I asked myself this question : If you have a hollow sphere with reflective surface on the inside and send light into it what happens to the light? and found a number of places where the question has been asked and answered.

One answer : talked about electro magnetic field being everywhere even in vaccuum before any light travels through it and went on to talk about the nature of light. This led me to another question.

If light is sent off through vaccuum space to another point, is it possible to detect that light from a point not inline with the path of light? Does the light 'disturb' the electro magnetic field in a way that's detectable?

I have only high school physics from 40 years ago but I try to understand. I have no doubt that I use the wrong terms and concepts to formulate the question.

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Last edited by adamjackson; Jan 23rd 2017 at 11:03 PM.
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Old Jan 23rd 2017, 04:04 AM   #2
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Your question could be recast as what is the size of a photon,
particularly perpendicular to its line of travel.

I don't know the answer, and await with interest if anyone else does.

One thought is that the energy of the photon will have a gravitational effect.
Although this will be ridiculously tiny in the extreme, it will (theoretically) be of infinite extent.
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Old Feb 7th 2017, 09:34 PM   #3
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I think the light just reflects in there.
So what is your ultimate question tho?
Like what aspect?
Cause a lot of things can happen during that reflection.
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