Thursday, 10 January 2013

general knowledge question


The twinkling of star is due to:

(kerala psc VILLAGE EXTENSION OFFICER 2005)

 (a) reflection (b) dispersion (c) absorption (d) refraction

ans: (d) refraction

  • Atmospheric refraction is the shift in apparent direction of a celestial object caused by the refraction of light rays as they pass through Earth’s atmosphere.

  • The twinkling of  stars and variation in size of the Sun are due to atmospheric refraction of starlight.

     refraction in the atmosphere

 

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