What is going on?
The light is internally bouncing within the water stream. producing a nicely focused beam of light.
Light travels through optical cables in a similar fashion, bouncing through the cables to convey information between users.
This process of light bouncing within a substance as it travels is known as Total Internal Reflection.
Find out more about this process here.
Try using a laser pointer with adult supervision... does this work better than the flashlight? Why?
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