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polarized light
Light produced by reflection or transmission through specialized media in which the electric & magnetic field of the different photons are all in 1 plane* transverse to the direction of propagation instead of in all planes.
* Electric & magnetic fields of light are in phase & orthogonal, transverse to the direction of propagation
References
Stedman's Medical Dictionary 27th ed, Williams &
Wilkins, Baltimore, 1999.