Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 Fluke 1/4/84; site fluke.UUCP Path: utzoo!watmath!clyde!floyd!vax135!cornell!uw-beaver!ssc-vax!fluke!pwl From: pwl@fluke.UUCP (Paul Lutt) Newsgroups: net.auto Subject: Re: Do fog lights help? ... Message-ID: <512@vax1.fluke.UUCP> Date: Fri, 17-Feb-84 11:22:06 EST Article-I.D.: vax1.512 Posted: Fri Feb 17 11:22:06 1984 Date-Received: Tue, 21-Feb-84 08:23:28 EST Organization: John Fluke Mfg. Co., Everett, WA Lines: 11 Someone in this group asked why fog lights are yellow. As I remember it from college physics, the water drops that make up fog scatter short wavelength light (blue) more than long wavelength light (red). Normal headlights emit light over a wide range of wavelengths. Yellow driving lights emit very little short wavelength light (blue), thus they are not scattered as much by the fog. Paul Lutt John Fluke Mfg. Co, Inc. Everett, WA {uw-beaver,decvax!microsof,ucbvax!lbl-csam,allegra,ssc-vax}!fluke!pwl