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Human Eye and Colourful World — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHuman Eye and Colourful World2 Marks
Question
Explain why the planets do not twinkle but the stars twinkle.
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Answer

Planets, being much closer to the earth are considered as extended source of light. Stars, being distant, are taken as point sized sources of light. The light coming from stars goes on varying due to atmospheric refraction pro-during twinkling effect.

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