Mirage

Mirage

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Credit: Phil Degginger/SCIENCE PHOTO LIBRARY

Caption: 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. Cold air is denser than warm air and, therefore, has a greater refractive index. As light passes from colder air across a sharp boundary to significantly warmer air, the light rays bend away from the direction of the temperature gradient.

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Keywords: air, atmospheric phenomenon, cold, illusion, illusory, mirage, optical, optics, phenomena, phenomenon, power grid, power lines, refraction, refractive index, transmission towers, vision, warm, water

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