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InYSDE,both slitsarecoveredbytransparentslab.Upperslitiscoveredbyslabof R.I.1.5andthicknesstandloweris coveredbyRI. 4/3 andthickness2t,thencentralmaxima

  1. shiftsin+vey-axisdirection    
  2. shiftsin-vey-axisdirection    
  3. remainsatsameposition    
  4. mayshiftinupward ordownwarddependinguponwavelengthof light    

The correct answer is: shiftsin-vey-axisdirection


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