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Answer:
This is an mirage former due to refraction of Sunrays. It is mainly find in the hot desserts.
When the heat from the Sundays is highly increased the air being closed to ground gets heated while the air at above some distance is cold. As the the Sunrays(light) from the sun travels from cold air to hot air, it gets refracted and an false image of the tree is formed. Hot air has moles away from each other so it is a rarer medium while cold air is denser medium. The object beyond and above the holy fires is formed in the same way. The air above the fire becomes hot and above some distance is cold and due to refraction the fire sometimes looks like wavy.
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Even I am in 10th STD SSC.
I knew the answer as it is from the chapter Refraction of Light.
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