Question

the sun can be seen about two min before sunrise and two min after sunset

Answer 1

This is happen due to refraction

Answer 2

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1. The earth is surrounded by an atmosphere which is denser near the surface of the earth.

2. When the rays of light from the Sun enter the earth's atmosphere from outer space, they travel from a rarer medium to a denser medium.

3. Hence, they bend towards the normal on refraction.

4. Hence, even when th sun is below the horizon while rising or setting, its rays reach is due to refraction and it appears to be on the horizon.

Therefore, the sun can be seen two minutes before sunrise and two minutes after sunset.

Hope it helps!

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