Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!ucbvax!LA.TIS.COM!rcs
From: rcs@LA.TIS.COM (Richard Schroeppel)
Newsgroups: comp.theory
Subject: geometry problem
Message-ID: <9002132315.AA01951@rhmr.com>
Date: 5 Mar 90 14:40:56 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: Richard Schroeppel <rcs%la.tis.com@VM1.NoDak.EDU>
Lines: 10

Suppose you have a planar polygon, not necessarily convex.
The interior face of each edge is a mirror.

A candle is lighted at some interior point.  The light spreads
out, reflects off the mirror edges and spreads further, etc.

Is any place inside the polygon completely dark?

Rich Schroeppel
rcs@la.tis.com