🚀 go-pugleaf

1. What is (are) the inherent qualitie(s) of a substance, such as glass,
perspex, diamond, & water, which make it transparent ?

2. What is the mechanism which makes the speed of light lower when travelling
in such a medium as opposed to traveling in a vacuum ?

I only ask these questions because they seem to me simple questions which
I would expect to know the answer to, but I having asked a number of graduate
scientists, I can't get a sensible answer. I think I know how (2) will be
answered, but I've got a follow up.

This isn't in any way homework. Am I getting no response because no-one knows ?

It seems sci.physics is dominated by arcane quantum mechanists, abstruse
general relativationists with a good mixture of non-scientists thrown in.

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| Dave Sixsmith                    |  Disclaim, disclaim, disclaim, etc.    |
| Bristol, England                 |                                        |
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