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Solution


Q.

Twinkling of stars is due to:
1 Reflection of light by clouds  
2 Scattering of light by dust particles  
3 Dispersion of light by water drops  
4 Atmospheric refraction of starlight  

Ans.

(4)

Twinkling of stars is due to atmospheric refraction of starlight. The refraction of light occurs in a medium of various layers of gradually changing refractive indices. A star always emits light but the different layers of refractive indices in our atmosphere allow it to seem like a twinkle. When light enters the earth and hits the atmosphere from a distance, it begins to refract the light into any layer it reaches. Thus, the star appears to twinkle.