Answer:
The polarization is defined by the plane in which the electric field is oscillating.
Explanation:
The polarization of an electromagnetic wave depends on the direction of the electric field. If the electric component is oscillating along the x-axis, the polarization will also be along the x-axis.
The polarization of the electromagnetic wave describes the magnitude and the direction of the electric field of the wave.
The polarization is defined by the plane in which the electric field is oscillating.