Laser refractometer
thingiverse
With this simple laser refractometer it will be possible to demonstrate the refraction of a laser beam through the surface of the water, suitable for all ages, the older ones and experts will be able to practice with the trigonometer to calculate the exact angle of refraction in comparison to the original beam , at the following video the explanation to conduct the experiment https://youtu.be/kxWIZwuE-lE
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