Interference figures

(Optics) the figures observed when certain sections of crystallized bodies are viewed in converging polarized light; thus, a section of a uniaxial crystal, cut normal to the vertical axis, shows a series of concentric colored rings with a single black cross; - so called because produced by the interference of luminous waves.

See also: Interference

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The simplest applications are measuring properties such as crystal angles, birefringance, and interference figures at constant elevated or reduced temperatures.

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