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Alternating Current — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsAlternating Current3 Marks
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.
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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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