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General
Easy

Question

In a Young's double slit interference experiment the fringe pattern is observed on a screen placed at a distance D from the slits. The slits are separated by a distance d and are illuminated by monochromatic light of wavelength lambda. Find the distance from the central point where the intensity falls to (A) half the maximum, (B) one fourth of the maximum.

  1. fraction numerator D lambda over denominator 4 text end text d end fraction comma fraction numerator D lambda over denominator 3 text end text d end fraction    
  2. fraction numerator D lambda over denominator d end fraction comma fraction numerator D lambda over denominator 2 text end text d end fraction    
  3. fraction numerator D lambda over denominator 2 text end text d end fraction comma fraction numerator D lambda over denominator 3 text end text d end fraction    
  4. fraction numerator D lambda over denominator 4 text end text d end fraction comma fraction numerator D lambda over denominator d end fraction    

The correct answer is: fraction numerator D lambda over denominator 4 text end text d end fraction comma fraction numerator D lambda over denominator 3 text end text d end fraction

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