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प्रश्न
A star sometimes appears brighter and some other times fainter. What is this effect called? State the reason for this effect.
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उत्तर
A star sometimes appears brighter and some other times fainter, this effect is called as twinkling effect. This effect arises due to atmospheric refraction. Our atmosphere is constantly moving. Light travelling from the stars gets bent in different directions making them twinkle.
संबंधित प्रश्न
Explain why the planets do not twinkle.
Atmospheric refraction causes advance sunrise and delayed sunset. By how much time is:
sunrise advanced?
Why do stars seem higher than they actually are? Illustrate your answer with the help of a diagram.
As light from a far off star comes down towards the earth:
(a) it bends away from the normal
(b) it bends towards the normal
(c) it does not bend at all
(d) it is reflected back
By how much time the day would have been shorter if the earth had no atmosphere?
State one effect produced by the scattering of light by the atmosphere.
Why does the sky appear blue on a clear day?
What causes the scattering of blue component of sunlight in the atmosphere?
The air layer of the atmosphere whose temperature is less than the hot layer behave as optically:
Assertion: Sky appears blue in the day time.
Reason: White light is composed of seven colours.
