Question

When we see any object through the hot air over the fire, it appears to be wavy, moving slightly.explain?

Answer 1

A very good question!

The answer lies in your question. It is the hot air! Fire creates a sort of blanket of hot air around itself and outside that is the cold air. The former one has a tendency to lift upwards, while that of the latter one is to come down. The hot air around the object rises, and cold air fills up the emptied space. This cool air again gets warmed, rises, and then replaced by the cold one. This process continues until fire blows out.

Now comes the optics into action! There is a little difference in the refractive indices of the hot and cold air. The behavior of the air of rising up and getting replaced, creates a continuous ripple of low and high refractive indices. Whenever light from the objects comes to you passing through this “arena”, it bends at different angles. This causes an illusion of object being moved when seen.

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Answer 2

Explanation:

The objects beyond the hot air appears to be wavy because the medium for light to pass through changes,l.

• the light passes from denser to rarer and then again to denser medium thereby causing refraction in the air.