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-----Original Message-----
From: Herbert H Gottlieb [mailto:herbgottlieb@JUNO.COM]
Sent: Tuesday, April 30, 2002 12:43 PM
To: PHYS-L@lists.nau.edu
Subject: Re: Test Writing
[snip]
1. You cannot always see a real image. The real images that
are formed
by
a convex lens or a concave mirror are usually invisible. To
see such an
image it is necessary to place a screen at the position that the image
forms . If a screen is not placed at the image position ,
the image is
still formed there .... but it is invisible.
2. You can see a virtual image. Just look into a plane
mirror and there
it is!