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Q.

How much time can the sun be seen before the actual sunrise?

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a

2 minutes

b

3 hours

c

2 seconds

d

20 minutes

answer is A.

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Detailed Solution

We can see the sun about

2

minutes before the actual sunrise because of atmospheric refraction.
"The refraction of light by the earth's atmosphere is called atmospheric refraction." Light from distant stars reaches the atmosphere of the earth. The atmosphere consists of layers of gases where the refraction of light takes place. Due to the refraction or bending of light, the sunlight reaches us 2 minutes before sunrise.

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