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Elliptic polarization describes a state of electromagnetic radiation where the electric field vector traces an ellipse in a plane perpendicular to the direction of wave propagation. This occurs when the wave is a combination of two perpendicular polarizations with different amplitudes and a phase difference.

Light waves are transverse, meaning their electric and magnetic fields oscillate perpendicular to the direction the wave travels. Unpolarized light has electric vectors oriented randomly. Plane-polarized light has electric vectors vibrating in a single fixed direction. Circularly polarized light is a special case of elliptic polarization where the electric vector rotates in a circle. Elliptic polarization represents a state between linear and circular polarization.123

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