Submitted by Grand-Tension8668 t3_1125ccr in askscience
karantza t1_j8kcf9s wrote
Reply to comment by Grand-Tension8668 in When measuring the wavelength of EM radiation... what's actually being measured? by Grand-Tension8668
It's definitely not a locational change, but it does have a direction and "intensity", which drawings often represent as if it were a distance.
The electromagnetic field is a vector field, so it points in a real direction, and that gives us polarization. So as light travels in a straight line, oscillating in intensity between the E and B fields over time, those fields do have a direction, but no distance offset from the beam path.
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