Thank you all for your responses, very informative
I did note that I can observe the light in a medium.
So here's how I got the observation:
1) stand about 2-3 meters from your plasma (flat screen TV, hopefully about 50 inch screen)
2) make sure it's off
3) shine a torch onto the TV screen and...
Please see my attachment of a recent observation of light traveling through a medium.
There is no source, just my observation
The packets of light appear to be visible, distinct , moving at different speeds, and display the various colours for each wavelength.
Is this normal / possible in a...