That oasis in the desert is just a trick of air and light.
, or the measurement of a bending ray of light as it passes through different mediums. Light travels in a straight line when moving through a single medium with uniform density, like only cold or only hot air, but the light changes its angle when it passes between two mediums of different densities. The warping that occurs at the boundary between hot and cold air creates the watery image we perceive.
Mirages work only when the viewer is far away from the front between the hot and cold air, though. Keeping with the roadway example, as the driver approaches the initially perceived location of the puddle, it disappears and appears to be hundreds of yards ahead again. “When you’re far away, the angle that you’re making with the surface of the hot-and-cold-air boundary is very shallow,” says Peter Tse, a professor of psychological and brain sciences at Dartmouth University.
“When you see a face in the clouds, that’s an illusion due to the way your brain works,” says Tse. “But mirages are not due to your brain—they’re due to the physics of light.” “Our brains are able to make sense of that in part because we’ve interacted with glass, the world, and we can move our head from side to side,” says Arthur Shapiro, a professor at American University and an editor of. “We can see different objects moving on different planes.”
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