Question

why do objects look swaying behind the fire?

Answer 1

because the air neat fire gets heated.the heated air disturbe the light ray passing through it.si the image looks swaying.the light ray gets refracted in heated air



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Answer 2

When air is heated the the surrounding air move upward...i.e from higher temp to lower temp....hence the air above the fire gets denser.According to law of light refraction...when light moves from rarer medium to denser medium,light rays bents away from normal.Hence with fluctuation in density fluctuation of image takes place.
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