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An insect starts moving up in a liquid from point o of variable refractive index mu equals mu subscript 0 end subscript left parenthesis 1 plus ay right parenthesis where y is depth of liquid from the surface. If u is the speed of insect, its apparent speed to the server E is

  1. u l n invisible function application left parenthesis 1 plus a H right parenthesis    
  2. fraction numerator u over denominator left parenthesis 1 plus a H right parenthesis mu subscript 0 end subscript end fraction    
  3. fraction numerator u over denominator l n invisible function application left parenthesis 1 plus a H right parenthesis end fraction    
  4. none    

The correct answer is: fraction numerator u over denominator left parenthesis 1 plus a H right parenthesis mu subscript 0 end subscript end fraction

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