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CBSE Class 12-science Answered

State two differences between diffraction and interference.
Asked by sunil2791 | 21 Feb, 2018, 06:11: PM
answered-by-expert Expert Answer
Differences between interference and diffraction of light:

Interference of light

Diffraction of light

  • Interference is due to the interaction of light coming from two different wavefronts originating from the same source.
  • Diffraction is due to the interaction of light coming from different parts of the same wavefront.
  • Interference fringes are of the same width.
  • Diffraction fringes are not of the same width.
  • All bright fringes are of the same intensity.
  • All bright fringes are not of the same intensity.
  • All points of minimum intensity are perfectly dark.
  • All points of minimum intensity are not perfectly dark.
  • The spacing between the fringes is uniform.
  • The spacing between the fringes is not uniform.
  • Interference phenomenon does not require an obstacle.
  • Diffraction phenomenon requires an obstacle.
  • Path of the wave stays intact after interference.
  • Diffraction changes the path of the incident wave
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