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Desert mirages were simulated in the laboratory by heating a flat surface ofsand. This showed that a boundary layer of air, of only a few millimetersimmediately covering a heated surface has nearly the same thickness over a widerange of temperatures. It consists of a region producing an inverted image, andanother producing an erect image depending on the relative distances betweenobserver, heated surface and object. Measurement of distances and heights showangles of incidence greater than angles of reflection. Air refractive indexmeasurements agree with involvement of the critical angle in ray bending. Ananalogy with density gradient sucrose solutions also shows double images,inverted and erect. It is assumed that a similar situation exists outdoors.Specular reflection over rough surfaces can be described as a mirage, but it isseen at a wider range of viewing angles, and it does not require a temperaturegradient. It is always present, but it can be obliterated by a higher intensityof diffuse reflection.

Temperature profile and double images in the inferior mirage