"Teacherjh" wrote in message
...

Although light is not conducted like RF, light behaves very much like RF
in
a wave guide.


In a wave guide appropriate to light frequency, or to radio frequency?

The size of waveguide is frequency dependant, but the EM characteristics of
light require only a difference of scale. Propigation is still a factor for
materials inside a waveguide though. So as to say, insulator materials may
act differenty to light than RF.