单词 | biprism |
释义 | biprism /buy"priz'euhm/, n. Optics. a triangular prism with an apex angle slightly less than 180°: when illuminated by a point source of light it produces two overlapping beams that form an interference pattern on a screen. Also called Fresnel biprism. [1880-85; BI-1 + PRISM] |
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