Physics
Grade-10
Easy

Question

The stars appear to twinkle from the Earth’s surface. This is due to ____.

  1. Reflection of light
  2. Dispersion of light
  3. Atmospheric refraction of light
  4. Internal reflection of light

Hint:

This is due to. frequent absorption of star light by earth's atmosphere.

The correct answer is: Atmospheric refraction of light


     
     The twinkling of a star is due to atmospheric refraction of starlight. 
     The starlight, on entering the earth’s atmosphere, undergoes refraction continuously before it reaches the earth. 
     The atmospheric refraction occurs in a medium of gradually changing refractive index. 
     The apparent position of the star is not stationary but keeps on changing slightly, since the physical conditions of the earth’s atmosphere are not stationary. 
     As the path of rays of light coming from the star goes on varying slightly, the apparent position of the star fluctuates and the amount of starlight entering the eye flickers – the star sometimes appears brighter, and at some other time, fainter, which is the twinkling effect.
     

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