6A40.40 Variable Index of Refraction Tank
Refractive index gradient, Fermat's principle, law of refraction
Light bends when travelling through a concentration gradient of sugar in water. The top layer of liquid is pure water while the bottom layer is concentrated sugar water. In these layers, there is no change in refractive index and no bending of light. In the middle, a gradient forms.
License: CC BY-NC 4.0. Non-commercial use allowed with attribution.
Demo video download.