Why is it that when an electromagnetic wave passes through a flat vacuum — nonconducting medium boundary: a) the component of the electric field strength perpendicular to the boundary decreases by a factor ε, but the parallel one does not change; b) the component of the magnetic field induction perpendicular to the boundary does not change, but the parallel one increases by a factor µ? ε is the dielectric constant and µ is the magnetic permeability of the medium.
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