Conchoid of Nicomedes from reflections and refractions in a cone

Reflections and refractions of a sheet of light from a truncated cone are shown to produce the ancient figure of the conchoid of Nicomedes when imaged on the basal plane. The idea can be easily demonstrated using a truncated cone (here a glazed flower pot is used) and a laser pointer. This result may be of interest in the area of nonimaging optics.