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Due to a vertical temperature gradient in the atmosphere, the index of refraction varies Suppose index of refraction varies as n equals n subscript 0 end subscript square root of 1 plus a y end root comma text  where  end text n subscript 0 end subscript is the index of refraction at the surface and a equals 2.0 cross times 10 to the power of negative 6 end exponent m to the power of negative 1 end exponent A person of height h = 2.0 m stands on a level surface Beyond what distance will he not see the runway?

  1. 2000 m    
  2. 3000 m    
  3. 2500 m    
  4. 3500 m    

The correct answer is: 2000 m

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