« on: 30/09/2017 19:11:07 »
I thought fields extended indefinitely in space.That image seems to show the two fields extending a finite distance .Do they actually extend indefinitely in the direction at right angles to the direction of propagation? (the image being for illustrative purposes)
Electromagnetic fields do extend indefinitely into space. What you are seeing in the image is the amplitude of the photon, which is different from the range of the field that makes up the photon. Amplitudes are finite. Even for a hypothetical, infinite ocean, the waves in the ocean will have a limited amplitude.
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