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The wavering/flickering effect seen above a fire occurs because the refracting medium (air) apparent position of objects to fluctuate

Question
The wavering/flickering effect seen above a fire occurs because the refracting medium (air) apparent position of objects to fluctuate
has a perfectly constant, unchanging refractive index everywhere
has physical conditions (temperature, density) that are not stationary, causing the
does not refract light at all
is a solid, not a gas
Answer
has physical conditions (temperature, density) that are not stationary, causing the
Detailed Explanation
The chapter explains that since the physical conditions of the air are not stationary, the apparent position of an object viewed through it fluctuates, causing the wavering effect.
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