A question I have often posed to those friends sad enough to to answer: If I thrust a lightsabre through a pane of galss end first, would the glass shatter or would I make a hole? I know that it depends on the glass etc, but can it be done. And, yes, I know that lightsabres aren’t real.
I think that would depend on the type of glass you tried to pass the LS through. Thinner glas might end up shattering, while it might make a clean hole on thicker glass.
What about this, though:
What happens when the power supply on a Light Sabre runs low? Would the beam of a fully charged LS pass right through the beam of the low charge LS? If I swung a one that was low on power and it, instead of cutting the thing I was singing at in half, swung all the way around and hit me, what would happen then?
First you have to say exactly what a lightsabre is, and how it works.
The closest thing in SF I’ve found is Larry Niven’s variable sword, which is a wire enclosed in a stasis field. If a ligh sabre is anything like that, it would certainly shatter glass.
FURRYMAN’S LAW OF FANTASY SCIENCE:
Anything you do in a science fiction movie/series is OK as long as you provide a psuedo-scientific explanation involving several scientific sounding made up words. (What are polarons, anyway?)
In other words: if the writers needed it, they’d write it in.