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From: JGA%MIT-MC@sri-unix.UUCP
Newsgroups: net.physics
Subject: What polishing does to the surface of rocks.
Message-ID: <637@sri-arpa.UUCP>
Date: Thu, 2-Aug-84 10:29:00 EDT
Article-I.D.: sri-arpa.637
Posted: Thu Aug  2 10:29:00 1984
Date-Received: Sat, 4-Aug-84 04:03:54 EDT
Lines: 14

From:  John G. Aspinall 

    Date: Wed, 1 Aug 84 8:33:15 EDT
    From: Pete Bradford (CSD UK) 
    To:   physics at sri-unix.arpa

    	Once the particle size becomes smaller than a value which
    is approximately the wavelength of light, radiation of that wave-
    length can no longer be affected by the said particles. no reflect-
    ion therefore takes place (no absorption either, presumably) and
    the 'powder' appears black.

Come on, if no reflection and no absorption take place, where does
the light go?  Transmission?  Be serious.