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From: debray@sbcs.UUCP (Saumya Debray)
Newsgroups: net.physics,net.space,net.research
Subject: Re: Star-Wars/Space Telescopes (parabolic mirrors)
Message-ID: <26@sbcs.UUCP>
Date: Sun, 24-Nov-85 14:48:57 EST
Article-I.D.: sbcs.26
Posted: Sun Nov 24 14:48:57 1985
Date-Received: Tue, 3-Dec-85 07:31:49 EST
References: <384@ukc.UUCP>
Organization: Computer Science Dept, SUNY@Stony Brook
Lines: 14
Xref: watmath net.physics:3647 net.space:4832 net.research:367

> We all know how you can make a parabolic mirror by stretching a thin
> film of aluminised plastic over a ring of metal or some other such
> material, then using a vacuum pump to suck the film into the shape of
> a parabola ...

Seems to me that since air pressure is the same in all directions, this
would give a spherical rather than a parabolic mirror.
-- 
Saumya Debray
SUNY at Stony Brook

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