Fiber optic cables use an optical phenomenon called total internal reflection to efficiently transmit light across long distances. This demonstration uses a laser pointer aligned with a hole punched into a bottle of water to showcase the effect. As the water flows out of the bottle, the laser light can be seen bending down the stream of water rather than continuing straight onwards. This occurs because the angle of incidence for the light is greater than the critical angle of the water-air interface, thus resulting in the light reflecting backwards within the water.
Source: https://youtu.be/woN9KpAGv4I
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