Re: [ATM] mirror or lens?

["Tom Moulton" <tom@moulton.us>]

Webster agrees with you.

http://www.m-w.com

> Hello,
>
> I was at a family lunch the other day and I was telling the folks about
> a  reflector telescope that my son and I just built.  Most of the
> family is  from a non-technical background, and one of them asked "How
> big is the lens?"
>
> I said, "Well, it's not really a lens, it's a series of two mirrors,
> and  the eye piece is really the only *lens* in the telescope."
>
> And one of the family members said, "A mirror is still a lens."  And
> he's  an astrophysicist, and who really wants to argue with an
> astrophysicist?  So I didn't knwo what to say.
>
> Anyway, I always thought that a mirror wasn't a lens, a lens was
> something  that light passed through and was changed, vs. a mirror that
> changed the  light by reflected it.
>
> Any thoughts on weather a mirror is a lens?
>
> Best,
>
> Mike
>
>
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