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Falling water drops from a dripping faucet, illuminated from above, exhibit arow of bright strips of light, a few centimeters apart at a fixed distancebelow the faucet. Flash photographs of the drops show that they are oblate inshape when the flashes occur and the bright flashes of light originate from theedge of the drop that is on the opposite of the overhead light source. Here weshow that that the spots result from the same internal reflection that givesrise to the rainbow in a cloud of spherical drops . The periodic flashesreflect the capillary oscillations of the liquid drop between alternatingprolate and oblate shapes and the dramatic enhancement in the oblate phaseresult from a combination of several optical effects. Ray tracing analysisshows that the flashes occur when the rainbow angle, which is 42 $\deg$ inspherical drops, but sweeps over a wide range between 35 $\deg$ and 65 $\deg$for typical ellipsoidal drops and the intensity of the caustic is stronglyenhanced in the oblate phase. This phenomenon can be seen in all brightly litwater sprays with millimeter size drops and is responsible for their whitecolor.

Flashes of light below the dripping faucet: an optical signal from capillary oscillations of water drops