Interesting facts about mirage
Mirages are of several types: lake or lower; upper (they appear right in the sky) or mirages of distant vision; side mirages.
A more complex type of mirage is called “Fata Morgana”
Lower (lake) mirage. The lower mirages occur predominantly in those cases when the layers of air at the surface of the Earth (for example, in the desert) are so heated that the rays of light emanating from objects are strongly bent.
The victims of mirages are especially often caravans in the Erg-er-Ravi desert in North Africa. At the distance of 2-3 kilometers, people see “oases” before people, to which, in reality, at least 700 kilometers
Upper mirage (mirage far vision)
The air is heated from the surface of the Earth, and with a height its temperature drops. However, if over a layer of cool air is warmer (brought, for example, by southerly winds) and a very rarefied air layer, and the transition between them is quite sharp, then refraction is greatly enhanced. Rays of light coming from objects on Earth describe the semblance of an arc and come back down, sometimes tens, even hundreds of kilometers from their source.Then there is a “raising the horizon,” or upper mirage.
On a clear morning, the inhabitants of the French Riviera saw on the horizon of the Mediterranean, where water merges with the sky, a chain of Corsican mountains rises from the sea, to which about two hundred kilometers from the Cote d'Azur.
Fata Morgana is a complex optical phenomenon in the atmosphere, consisting of several forms of mirages, in which distant objects are seen repeatedly and with various distortions. For this, the most mysterious type of mirages convincing explanation has not yet been found. But, there are many theories.