Physics
Grade-10
Easy
Question
Due to atmospheric refraction the duration of a normal day _____ by____ minutes.
- Decreases, 2
- Increases, 2
- Decreases, 4
- Increases, 4
Hint:
Due to atmospheric refraction, the sun is visible two minutes after actual sunset. Thus, the time difference between actual sunset and apparent sunset is 2 minutes.
The correct answer is: Increases, 4
In the absence of atmosphere there won't be atmospheric refraction and hence no advanced sunrise and no delayed sun set. So length of day will shorter by 2+2=4minutes.
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