Question
Compare and explain three distinguishing features observed in Young’s double slit interference pattern with those seen for a coherently illuminated single slit producing diffraction pattern.

Answer

Interference Diffraction
  1. Equally spaced fringes.
  2. All maxima have equal brightness.
  3. Formed by superposition of wavefronts from two coherent sources.
  4. There is a maxima at the angle $\lambda$/a.
  5. Quite a large number of fringes are easily observable.
  1. Fringes are not equally spaced.
  2. Intensity of maxima keeps on decreasing.
  3. Formed through superposition of wavelets from a single wavefront.
  4. First minima occurs at an angle $\lambda$/a.
  5. It becomes difficult to distinguish maxima and minima after a few fringes.

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