Question

Why do stars twinkle give easy answer for 3 marks class 10th question is it

Answer 1

When light travels from one medium to another, it undergoes refraction and hence its path changes.

Similarly in our atmosphere also there are various layers of air (denser and rarer) due to which their refractive indices are also different. All the stars that we see are very far away from us and therefore they can be considered as point like sources of light. So when the light from the stars enter the atmosphere they pass through denser and rarer mediums hence undergoing refraction continuously. As a result of this refraction the apparent positions of the stars are changing continuously and it seems that the stars are twinkling.
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Answer 2

the rays of light coming from the stars travel through layers of varying densities .these rays get refracted continuously and they bend towards the normal as the refraction is from rarer to denser medium . the movement of air and convection currents cause a change in the density of layers .as a result the position of the image of the stars goes on changing after every short interval ..these different positions of the image is formed at short intervals of time give the impression that the stars twinkling.
जब स्टार्स की लाइट earth ke atmosphere में आती है तो उसे बहुत से layers से गुजरना पड़ता है जिनकी डेंसिटीज अलग-अलग होती है इसलिए स्टार्स की पोजीशन चेंज होती रहती है और air movement के कारण मतलब जो एयर फ्लो होती है उसकी वजह से उसकी डेंसिटीज बदलती रहती है टाइम टू टाइम इस वजह से एवरी शॉट interval पर स्टार्स की पोजीशन चेंज होती रहती है जिसके कारण हमें स्टार्स ट्विंकल होते हुए दिखाई देते हैं