Re: [ATM] mirror or lens?

["Vladimir Galogaza" <vladimir.galogaza@zg.htnet.hr>]

Mike,

>And one of the family members said, "A mirror is still a lens."  And he's
>an astrophysicist,

Karl Popper in his  Autobiography  "Unended Quest" said:
"It is impossible to speak in such a way that you cannot be misunderstood."

Astrophysicists sometimes call interaction of light and gravity field a
"lensing".
Device in electron microscope which serves to focus electrons is called
lens but electrons interact with electromagnetic field
while in glass lens and in mirror (refraction and reflection)
 light interacts with matter (electrons).
Coloquial and conceptual meaning of words can differ.
What matters is context.

Ken is right "A rose by any other name is still a rose..."
And family lunch discussions are often competition of egos.

Regards
Vladimir.






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