Take a look at this video from \(2:44\) to \(3:00\) . Can anyone explain why does the light bends ?
2 years, 5 months ago
It's TIR- total internal reflection. You can pretty much do it with any transparent tube with a higher optical density than air. I did it with a glue stick from my glue gun. It diffused the light, but you could see it reflecting instead of passing through the side. Antifreeze, some glycol (ethylene or propylene) works better than water. Engineer guy, on youtube, had a similar demonstration, but it was much clearer than the video that you linked.
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