Re: TIR in periscopes

[Digby Willard <dwillard@MAIL.CENTRAL.STPAUL.K12.MN.US>]

I want to add my kudos and thanks to Herb's comments below.  I posted the
question this morning, and by third hour had a substantially expanded
explanation for the curious.

Digby





 Herbert H Gottlieb wrote:
> Michael's response to the question about the use of prisms instead of
> mirrors in a  periscope is one of the best responses that I have ever
> read.  It gives a thorough coverage of the subject using simple language,
> clear writing and good grammar.  He uses numbered paragraphs, each
> starting with a sentence that captures interest followed by sentences
> that develop the theme with simple explanations and clear reasoning.  It
> is unusual to find such a beautifully written e-mail these days when
> everyone is in such a hurry to get on with more pressing issues that come
> up each day.
> Wouldn't it be nice if a whole physics textbook could be written with the
> same approach?
>
> Herb Gottlieb from New York City
> (Where clear thorough explanations are appreciated)