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Shine a laser through a hollow tube kind of question

If you have a glass-top table witha beveled edge before the edge of the glass, you can shine the laser into the glass perpendicular to the beveled plane (or make adjustments) and you can see the laser bouncing back and forth inside the glass. I guess this is because at the angle the laser enters the glass, it transmits, but then when the laser gets reflected off the parallel sides, the angle is more acute and reflects.
 





BShanahan14rulz said:
If you have a glass-top table witha beveled edge before the edge of the glass, you can shine the laser into the glass perpendicular to the beveled plane (or make adjustments) and you can see the laser bouncing back and forth inside the glass. I guess this is because at the angle the laser enters the glass, it transmits, but then when the laser gets reflected off the parallel sides, the angle is more acute and reflects.
Click to expand...

What if you used a line-generating laser, with this table-top? I would expect an array of lines across the surface, with the spacing being adjustable by tilting the laser. Could be useful for times when you need to do some layout work. Do that in two perpendicular directions, and you have some custom grid-lines across your table!
 
You don't get a nice even pattern in practical application though. The beam will bounce aorund in the glass, but real glass tables arent straight enough to produce any sort of usable grid. If you just want some zigzag lines as a conversation piece it'll work fine though :)
 
Benm said:
You don't get a nice even pattern in practical application though. The beam will bounce aorund in the glass, but real glass tables arent straight enough to produce any sort of usable grid. If you just want some zigzag lines as a conversation piece it'll work fine though :)
Click to expand...

Well I wouldn't tell anyone my tables grid wasn't spaced evenly enough!:shhh:
 
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