Due to atmospheric refraction of sunlight, the time from sunrise to sunset is lengthened by about [[1]] minutes.

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Detailed Solution

Due to atmospheric refraction of sunlight, the time from sunrise to sunset is lengthened by about

4

minutes.
Light from distant stars reaches the atmosphere of the earth. The atmosphere consists of layers of gases where the refraction of light takes place. So we can see the sun about

2

minutes before the actual sunrise and about

2

minutes after the actual sunset because of atmospheric refraction. Hence the total increase in time from sunrise to sunset is

4

minutes.

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