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Fresnel's bi-prism |
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bi-prism, Fresnel's Optical device consisting of two prisms of very small refracting power, set base to base and which forms two images of a single source. It is often used to produce interference fringes. It may also be used to measure cyclophoria. Syn. double prism; Fresnel's double prism; Maddox bi-prism; Maddox double prism. See interference fringes; Wollaston prism; double prism test. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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