Question

Actually sun is visible before sunrise and after sunset for sometime. EXPLAIN THIS..​

Answer 1

Answer:

This is due to the atmospheric refraction of light.

• This is because when light enters from vacuum to earth's atmosphere,it basically enters from rarer to denser medium and bends towards horizon. During sunrise, when the sun is just below the horizon, our atmosphere causes the light rays to bend and we see the sun early.
• The time difference is of approximately 2 minutes.
• Also due to this reason we see the sun after the actual sunset.

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