hydrostaticequil
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If so what does the reflection look like?
What would a reflection look like in the fourth dimension?
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pinball1970
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Physicists refer to three dimensions of space and one of time usually. I am not sure what you mean by "reflection."hydrostaticequil said:If so what does the reflection look like?
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What do you mean by the fourth dimension?
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Welcome to PF.
A "phase conjugate mirror" might reflect EM radiation, back the way it came, in effect backwards in time. That would cause things that reflect light or radar to cancel with themselves, becoming invisible. There has been military research into the field of making things invisible, but I don't think there has been any real success.
https://en.wikipedia.org/wiki/Nonlinear_optics#Optical_phase_conjugation
How will you make the mirror?hydrostaticequil said:If so what does the reflection look like?
A "phase conjugate mirror" might reflect EM radiation, back the way it came, in effect backwards in time. That would cause things that reflect light or radar to cancel with themselves, becoming invisible. There has been military research into the field of making things invisible, but I don't think there has been any real success.
https://en.wikipedia.org/wiki/Nonlinear_optics#Optical_phase_conjugation
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I would define a reflection as a linear map that changes the sign in one dimension and keeps all other dimensions fixed. This is independent of the number of dimensions.hydrostaticequil said:If so what does the reflection look like?
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