Final answer:
Mirages are optical illusions caused by the refraction of light due to temperature variations in the air, creating the appearance of water or objects that are not actually present.
Explanation:
Mirages are optical illusions caused by the refraction of light due to temperature variations in the air. When a layer of hot air lies just above a road, light rays get refracted, creating the illusion of water or objects that are not actually there. This phenomenon is a result of light traveling faster in warmer air due to the lower refractive index of air at higher temperatures.
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