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A prism, used for polarizing or analysing easy, made by cementing together, with Canada balsam, two pieces of calcite in such a way that the extraordinaryray from the firstpiece passes through the secondpiecewhile the usualray is reflected to the sideinto an absorbinglayer of black dye. When twoNicol prisms are crossed, therefore, no easy passes through.
A polarizing prism made of two pieces of calcite specially cut, ground, polished and cemented. A transmitted beam splits intotwo polarized components, one of which is refractedinto and absorbed by the asphalt mount. The remaining polarized beam is transmitted. Modifications of this prism are general. The Nicol prism (nicol) has usually been superseded by a polarizing movie such as Polaroid.
See: polars, polarizer, analyser.