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प्रश्न
Due to atmospheric refraction of sunlight, the time from sunrise to sunset is lengthened by about:
(a) 6 minutes
(b) 2 minutes
(c) 4 minutes
(d) 5 minutes
उत्तर
4 minutes
Because of the atmospheric refraction of sunlight, we can see the sun about two minutes before the actual sunrise and two minutes after the actual sunset. Therefore, the time from sunrise to sunset is lengthened by about four minutes (two minutes because of advanced sunrise and two minutes because of delayed sunset).
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संबंधित प्रश्न
Explain why the planets do not twinkle.
Name two effects produced by the atmospheric refraction.
Fill in the following blank with suitable word:
We can see the sun about ................ minutes before the actual sunrise and about ................ minutes after the actual sunset because of atmospheric ................
Why do stars seem higher than they actually are? Illustrate your answer with the help of a diagram.
The stars twinkle but the planets do not twinkle at night because:
(a) the stars are small but the planets are large
(b) the stars are very large but planets are small
(c) the stars are much nearer but planets are far off
(d) the stars are far off but planets are nearer to earth
A student claims that because of atmospheric refraction, the sun can be seen after it has set, and the day is, therefore, longer than if the earth had no atmosphere.
What does the student mean by saying that the sun can be seen after it has set?
A student claims that because of atmospheric refraction, the sun can be seen after it has set, and the day is, therefore, longer than if the earth had no atmosphere.
Do you think that the students conclusion is correct?
A star sometimes appears brighter and some other times fainter. What is this effect called? State the reason for this effect.
Refraction of light by the earth’s atmosphere due to variation in air density is called ____________.
How does refraction take place in the atmosphere? Why do stars twinkle but not the planets?
