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Alternate Titles: electron polarization, electronic polarization. Electric polarization, slight relative shift of positive and negative electric charge in opposite directions within an insulator, or dielectric, induced by an external electric field.
The complete polarization of monochromatic light is characterized by the projection of the path of the end of the electric vector (Figure 1) at each point of the ray onto a plane perpendicular to the ray. In the most general case of elliptical polarization, the projection is an ellipse.