> However, it's really damn unusual for a material's electrical or magnetic 
> properties to have any bearing at all on its optical properties.

I thought it was quite common, eg nearly all electrical conductors are 
opaque.

> * Impure water is an excellent conductor, while pure water is a very good 
> insulator. Yet both substances have almost identical optical properties.

I wouldn't exactly call impure water an "excellent" conductor, but more 
conductive than pure water yes...

> (I still can't figure out why you can use an oscilator to make radio 
> waves, but not light rays...)

Lasers?

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