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Atmospheric refraction occurs because the earth's atmosphere has a refractive index that

Question
Atmospheric refraction occurs because the earth's atmosphere has a refractive index that
is exactly uniform throughout, with no variation at all
gradually changes with altitude/density
only affects red light
is negative
Answer
gradually changes with altitude/density
Detailed Explanation
The chapter states that atmospheric refraction occurs in a medium (the atmosphere) of gradually changing refractive index.
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