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What is the difference between the actual sunset and apparent sunset?

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in Engineering Physics II by (679k points)
What is the difference between the actual sunset and apparent sunset?

(a) 2 seconds

(b) 30 seconds

(c) 1 minute

(d) 2 minutes

I had been asked this question in semester exam.

I want to ask this question from Velocity of Light in section Optics of Engineering Physics II

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The correct answer is (d) 2 minutes

The best explanation: The refractive index of the earth’s atmosphere relative to vacuum is about 1.00029. Thus, the speed of light is less in the earth’s atmosphere as compared to vacuum. Hence, there is a shift in the direction of the incident light, and due to that there is a 2 minutes’ time difference between the actual sunset and apparent sunset.

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