A gravitational mirage is the visual impression caused by a so-called gravitational lens in space, which may include multiple images, rings, etc of background light sources. A gravitational lens is formed when the light from a very distant bright source (such as a Quasar) is "bent" around a massive object (such as a cluster of This is analogous to the familiar mirage which can frequently be observed where the air temperature varies strongly with height over the ground (or sea). A mirage is a naturally-occurring Optical phenomenon, in which light rays are bent to produce a displaced image of distant objects or the sky The rapidly changing refractive index produces inverted images "floating" in the air. The refractive index (or index of Refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves is reduced inside the medium
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