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To an observer on the earth the stars appear to twinkle, this is because:
  • a)
    The fluctuations of refractive index inside earth’s atmosphere.
  • b)
    Effect of mirage
  • c)
    Total internal reflection
  • d)
    Tyndall effect
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
To an observer on the earth the stars appear to twinkle, this is beca...
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.
Since the atmosphere bends starlight towards the normal, the apparent position of the star is slightly different from its actual position.
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To an observer on the earth the stars appear to twinkle, this is because:a)The fluctuations of refractive index inside earth’s atmosphere.b)Effect of miragec)Total internal reflectiond)Tyndall effectCorrect answer is option 'A'. Can you explain this answer?
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