Mirage over Paris,coloured historical engraving. This mirage was seen between 3am and 4am in December 1869. This type of mirage,where the virtual object is seen above the real one,occurs when a layer of warm air lies above a cold layer of air. The warm air has a higher refractive index,and this bends light back towards the ground. Engraving from The Atmosphere (1873) by Camille Flammarion | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Terry, Sheila |
Taille de l’image : | 4167 px × 2775 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |