Re: Noah's formation: The rainbow

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Article #1359

#1359

From: Brett J. Vickers
Date: Wed, 22 Jul 1992 23:28

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peterk@public.sub.org (Peter Kittel) writes:
>Is it only me or does the sky beneath a rainbow also appear lighter
>to others than the sky above a rainbow (or wait, was it the other way
>around?)? But anyway, for my eye there is definitely a jump in
>brightness of the background sky (normally rain clouds) from beneath
>to above the rainbow. Any explanation for this?

Optical illusion?  Two fields of the same color, separated by a line
of a brighter or darker color, give the optical illusion that one half
is lighter than the other.  The trick is to cover the line and see that
they are the same.  I've never tried this with a rainbow.

--
 ___            _    _     _  _        _
(  _) ___ ___ _( )__( )_  ( )( ) o  __( ) _  ___  ___  ___
(___)(_) (__=) (_)_ (_)_   (__) (_)(_((_)(_'(__=)(_) _(_)
Brett Vickers (bvickers@ics.uci.edu)

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Path: arc1-ca.pugleaf.net!sparky!uunet!news.claremont.edu!ucivax!bvickers
From: bvickers@valentine.ics.uci.edu (Brett J. Vickers)
Subject: Re: Noah's formation: The rainbow
Nntp-Posting-Host: valentine.ics.uci.edu
Message-ID: <2A6DEF17.1804@ics.uci.edu>
Newsgroups: sci.physics
Reply-To: bvickers@ics.uci.edu (Brett J. Vickers)
Organization: Univ. of Calif., Irvine, Info. & Computer Sci. Dept.
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Date: 22 Jul 92 23:28:23 GMT
Distribution: sci
References: <1992Jul20.091322.13842@vax5.cit.cornell.edu> <1992Jul21.165921.29128@public.sub.org>

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