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Which of these phenomena is NOT attributed to atmospheric refraction in the chapter?

Question
Which of these phenomena is NOT attributed to atmospheric refraction in the chapter?
Advance sunrise
Delayed sunset
Twinkling of stars
The red colour of danger signal lights
Answer
The red colour of danger signal lights
Detailed Explanation
The red colour of danger signal lights is explained in the chapter under scattering of light (red is least scattered), not atmospheric refraction.
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