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The wavering of objects seen above a fire and the twinkling of stars are described in the chapter as being

Question
The wavering of objects seen above a fire and the twinkling of stars are described in the chapter as being
completely unrelated phenomena with different causes
similar phenomena, both effects of atmospheric refraction, differing mainly in scale
caused by dispersion, not refraction
visible only through a telescope
Answer
similar phenomena, both effects of atmospheric refraction, differing mainly in scale
Detailed Explanation
The chapter explicitly connects these as similar phenomena: the wavering above a fire is atmospheric refraction on a small scale, while twinkling is a similar phenomenon on a much larger scale.
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