Re: What is a Fresnel lens? -- was Re: That Magic TV screen

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Article #6578

#6578

From: Henry Spencer
Date: Fri, 28 Aug 1992 20:42

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In article <1992Aug25.172720.7172@athena.cs.uga.edu> mcovingt@athena.cs.uga.edu (Michael A. Covington) writes:
>Two different devices are called a Fresnel lens:
>
>(1) A device that works by diffraction, and is seen mainly in optics
>textbooks.  This device is very wavelength-specific.

Calling this a Fresnel lens is simply incorrect.  It's a Fresnel zone plate.
-- 
There is nothing wrong with making      | Henry Spencer @ U of Toronto Zoology
mistakes, but... make *new* ones. -D.Sim|  henry@zoo.toronto.edu  utzoo!henry

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References: <1992Aug23.175543.18596@usenet.ins.cwru.edu> <76160028@hpldsla.sid.hp.com> <1992Aug25.172720.7172@athena.cs.uga.edu>

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Newsgroups: sci.electronics
Path: arc1-ca.pugleaf.net!sparky!uunet!sun-barr!cs.utexas.edu!torn!utzoo!henry
From: henry@zoo.toronto.edu (Henry Spencer)
Subject: Re: What is a Fresnel lens? -- was Re: That Magic TV screen
Message-ID: <Btpo71.465@zoo.toronto.edu>
Date: Fri, 28 Aug 1992 20:42:35 GMT
References: <1992Aug23.175543.18596@usenet.ins.cwru.edu> <76160028@hpldsla.sid.hp.com> <1992Aug25.172720.7172@athena.cs.uga.edu>
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