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प्रश्न
Explain why the planets do not twinkle but the stars twinkle.
Why do the stars in the sky appear twinkling but planets do not?
Explain the following:
Why do stars twinkle but not planets?
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उत्तर
The planets being closer to the earth do not appear as point sources of light. The planet covers a small circular area in space, when viewed from earth. So, even if light from one point in the circular disc is blocked, light from other points reaches our eyes. As the light from the planets are not completely blocked from our sight and they do not twinkle. Stars, on the other hand are point sized objects and twinkle by atmospheric refraction of light.
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संबंधित प्रश्न
What is atmospheric refraction? Use this phenomenon to explain the following natural events:
Advanced sun-rise and delayed sun-set.
Draw diagrams to illustrate your answers.
Explain why the planets do not twinkle.
The correct sequencing of angle of incidence, angle of emergence, angle of refraction and lateral displacement shown in the following diagram by digits 1, 2, 3 and 4 is:
(a) 2, 4, 1, 3
(b) 2, 1, 4, 3
(c) 1, 2, 4, 3
(d) 2, 1, 3, 4
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 ................
What is atmospheric refraction?
Why does the sky appear blue on a clear day?
The air layer of the atmosphere whose temperature is less than the hot layer behave as optically:
Refraction of light by the earth’s atmosphere due to variation in air density is called ____________.
Explain the refraction of light through a triangular glass prism using a labelled ray diagram. Hence define the angle of deviation.
