Leo Lichtman wrote:

Jon Anderson wrote: (clip)This is a concave mirror that magnifies, has a
focal distance of approx 2" (clip)
^^^^^^^^^^^^
This puzzles me. I take it that you are able to look at your own eyeball
with the mirror 2" away. But, how would a dentist use it? Wouldn't he have
to place his eye 2" from your mouth?

Nope. The mirror would have to be 2" or somewhat less from the *tooth*.

I've never seen a dentist do anything
like that. And if my dentist did that, I would be tempted to kiss her on
the lips. :-)

Pretend you didn't read the above and go for it. :-)

Ted