Explain in brief the reason for each of the following ...
(a) Advanced sunrise
(b) Delayed sunset...

Dear Student ,
The Sun is visible two minutes before the sunrise and two minutes after the Sunset, because the light gets bent due to atmospheric refraction. The light from the Sun gets refracted by the presence of atmospheric layers and reaches the observer. But the observer think that the light is coming straight from the Sun.
a) Advanced sunrise is because of continuous atmospheric refraction that happens because density of atmosphere is more near the earth surface. as the ray of light that enters atmosphere not close to land they are refracted and due to continuous refraction the sunlight reaches land even after 2 min of original sunset.
Hope it helps 

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