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Re: Writing Lectures

On Tue, 30 Apr 2002 06:13:38 -0700 Dana Andrews <danaandrews2@YAHOO.COM>
writes:
I like to start with a thought provoking demo that sets up the
lesson. example: Using the double concave mirror toy to demonstrate a

virtual image.

Why do you use a DOUBLE concave mirror?
Won't a single concave mirror do gthe job?

Herb Gottlieb from New York City
Where it is almost impossible to find a double concave mirror in our
science supply catalogs.