# After a 'reflection phase change' of a light wave, are the magnetic ($B$) and electric ($E$) fields really out of sync with each other?

Wikipedia says the Electric-field shifts by 180-degrees, but the Magnetic-field by 0-degrees.

Are there other instances where the $$E$$-field and $$B$$-field of an EM-wave are out-of-sync (out-of-phase, unsynchronized, whatever) with each other? Do they stay that way?

Since the B-field is in the direction of $$\vec{k}\times \vec{E}$$, where $$\vec{k}$$ is the wave vector, then since both $$\vec{k}$$ and $$\vec{E}$$ are reversed, then the B-field direction is unchanged.
In general there is a phase difference between the E- and B-fields whenever a wave travels in a medium with a non-zero conductivity. For an ideal conductor, the phase difference is $$\pi/4$$.