Laboratory experiment demonstrates inertial waves generated in the fluid on the rotating platform. The waves refract on a vortex. The vortex makes the depression in the surface of water and works as a lens for the waves. The interesting feature of the inertial waves is that the phase propagates towards the source rather than away from the source (as is the case for gravity capillary waves). The topography of the water surface is visualized by optical altimetry. For details see www.physics.mun.ca/~yakov
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