Wollaston prism

noun

Definition of Wollaston prism 

: a double-image compound prism producing two divergent beams of light plane-polarized at right angles to each other and consisting of two equal right-angled prisms of Iceland spar or quartz cemented along their long faces and so cut that in one the light passes along the optic axis and in the other at right angles to that axis

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History and Etymology for Wollaston prism

after William H. Wollaston †1828

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