Mirage usually forms when the weather is hot. The density of hot air is less than the density of cool air.
As light travels through the air, it changes speed as it gets closer to the ground due to the hot air from the ground.
The light bends away from the normal.
It keeps on bending as it gets closer to the ground until it head towards the opposite direction and travels into our human eyes. but our human eyes assume the light travels in a straight line, so we thought that the object is on the ground, but the object that we see is actually an image that refracts into our eyes.
This is an image of mirage on a driveway:
Explain why you see lightning before you hear thunder.
We see lightning before we hear thunder because light travels much faster than sound.
Light travels at 299,729, 485 miles per second and sound only travels at 340 miles per second.
The speed of light is approximately 881,500 times faster than the speed of sound, and thus lightning is visible to our eyes before we hear claps of thunder during a storm.
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