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...fringent plate, usually made from [[mica|mica]], cut such that its optical axis is parallel to the front and back surfaces. Quarter-wave plates are used as

...igning the fiber length and width in parallel or perpendicular to the long axis of the Red I plate, a known amount of retardation of light is added and the Molecular Expressions, Optical microscopy primer, https://micro.magnet.fsu.edu/primer/