A plane electromagnetic wave is the superposition of two independent orthogonal plane waves and can be written as a real part of É = E; exp (ilkz - wt])ū, + Ez exp (i[kz - wt + a)ū, where k w. E and E, are real If E, = E the electric fieid vector will describe a trajectory which, seen along the z axis from the positive side and looking towards the orig stranht at125°wuth resnect

A plane electromagnetic wave is the superposition of two independent orthogonal plane waves and can be written as a real part of É = E; exp (ilkz - wt])ū, + Ez exp (i[kz - wt + a)ū, where k w. E and E, are real If E, = E the electric fieid vector will describe a trajectory which, seen along the z axis from the positive side and looking towards the orig stranht at125°wuth resnect