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zone plate |
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zone plate [′zōn ‚plāt] (optics) A plate with alternate transparent and opaque rings, designed to block off every other Fresnel half-period zone; light from a point source passing through the plate produces an intense point image much like that produced by a lens. 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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For Fresnel zone plates, f [approximately equal to] 2R[delta]R/[lambda] (for R >> [delta]R), so for a Fresnel zone plate I [approximately equal to] [delta]R. |
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