Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!watmath!clyde!burl!mgnetp!ihnp4!zehntel!hplabs!sri-unix!JGA@MIT-MC 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. AspinallDate: 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.