Why do objects waver when see on a really hot day?
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The waves that seem to appear near hot objects, like a campfire on a cool night, result from a phenomenon called refraction. Refraction happens when light that is passing through one substance, like air, changes its speed when it enters another substance, like glass or water.
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We observe random wavering or flickering of the objects near a fire on a very hot day due to atmospheric refraction. Refractive index of the hot air is slightly less than that of the cold air. Since, the density does not remain the same , the Apparent position of the object as seen through hot air ,fluctuates.
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