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I don't think it matters

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battl...@webtv.net

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Jan 9, 1999, 3:00:00 AM1/9/99
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Lindashm

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Jan 9, 1999, 3:00:00 AM1/9/99
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>battl...@webtv.net wrote:
[snip]
> It makes absolutely no difference what the magnifying
>glass is made from (glass, pastic or even quartz). As long as it focuses
>the sun's rays into a point.

What really frightens me about this person is that what he is proposing as a
*treatment* is so easy to try.

I have very fair skin and have had innumerable blistering sun burns (back when
I was young and stupid and thought a tan was worth it). I am fairly
knowledgeable about skin cancer - the types and the risk factors (I have a very
strong history of it in my family).

Despite all this, it *actually* crossed my mind for a few seconds that this
joker's remedy was something I could try out!

Someone who is not well-versed in skin cancer info might not be aware of the
potential dangers and think it's worth a try.

This is why I have such a problem with him (not because he suffers from
delusional disorder-grandiose type). I'm truly hoping he will at some point
decide that posting here is not worth all the negative feedback.

-Linda

DaveW

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Jan 11, 1999, 3:00:00 AM1/11/99
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> It makes absolutely no difference what the magnifying glass is made
> from (glass, pastic or even quartz). As long as it focuses the
> sun's rays into a point.

Of course it matters. UV is a particular part of the electromagnetic
spectrum. Different substances are transparent to different sets of
wavelengths. Some glass is opaque to UV, some isn't. Go look at the
amazing array of photographic filters for examples from the visible
spectrum. Heck, look in my refrigerator: not a lot of red light gets
through that bottle of Rolling Rock. And this phenomenon is true of
gases, also. The reason UV telescopes are launched into orbit is
that the Earth's atmosphere is very opaque when it comes to UV.
Without ozone, we'd all be fried. And it's true of liquids. The
reason submarines and fish finders use sonar instead of radar is due
to the fact that water is very opaque to radio frequencies.

- Dave W.

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