brewster

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brewster

[′brü·stər]
(optics)
A unit of stress optical coefficient of a material; it is equal to the stress optical coefficient of a material in which a stress of 1 bar produces a relative retardation between the components of a linearly polarized light beam of 1 angstrom when the light passes through a thickness of 1 millimeter in a direction perpendicular to the stress. Abbreviated B.