Assertion: right angle prism | /r/HasAspect | a surface quality
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Source sentences:
text: Berliner Glas's prism systems offer 20[micro]m optical path length difference or [lambda]/10 of wavefront accuracy, while Esco Optics' right-angle prisms , equilateral prisms and laser prisms have a surface quality better than laser grade, 10-5, or [lambda]/20.