Denny wrote:
Roy,
I haven't reviewed the physics of relativity lately, but I 'believe'
that value of C is specified as the velocity of energy propagation in a
vacuum... SInce that limit is not violated when the wave front is
propagating in a medium with a refractive index greater than vacuum,
i.e. C is slower than in a vacuum, then by O'Connor's Law of
Reciprocity the limit will not be broken if the the wave front is
propagating a medium with a refractive index less than a vacuum, i.e. C
is greater than in a vacuum...

denny / k8do

Denny

I'm afraid I don't understand your post at all. Perhaps you are kidding
and I am fished in. So be it.

I do not understand how EMR can travel in any medium "faster" than in a
vacuum. Regarding Ray's post, I don't have a precise definition of
velocity factor but I suspect it is not describing wave propagation
directly. (And I am speaking as a total mathematical pedestrian

Negative refraction is damned puzzling ... and fascinating. Richard
seems to have the best links on the subject.

John
AB8O