Question 6 - MCQs from NCERT Exemplar - Chapter 11 Class 10 - Human Eye and Colourful World

Last updated at August 12, 2026 by

Twinkling of stars is due to atmospheric

(a) dispersion of light by water droplets

(b) refraction of light by different layers of varying refractive indices

(c) scattering of light by dust particles

(d) internal reflection of light by clouds

 

Answer

  • The different atmospheric layers have varying optical densities (refractive indices). 
  • This results in star-light undergoing refraction multiple times before it reaches our eyes. 
  • So a star appears to change its position (twinkle) to the human eye because of atmospheric refraction. 

Why do stars twinkle-01.jpg

So, the correct answer is (b)

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