Kelvin Wave Causing waves on the interface between water and oil in a rotating system

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Water tank Material Pyrex glass Height: 20cm Depth: 40cm Width: 40cm   Working fluid Top layer: water Bottom layer: a mix of limonene and methylene bromide   Visualization The optical rotation properties of limonene was used to make the waves visible. A polarizing finter was placed under the water tank, and a white light was shone from below the tank. The light was then observed after passing through another polarizing filter.1)   Experimental process After spinning the tank, a wave-making block hung at the interface was oscillated vertically to create waves at the interface.