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Conditions for Observing Interference

  • The initial phase difference between the interfering waves must remain constant. Otherwise the interference will not be sustained.
  • The frequency and wavelengths of two waves should be equal. If the phase difference will not remain constant, so the interference will not be sustained.
  • The light must be monochromatic. This eliminates overlapping of patterns as each wavelength corresponds to one interference pattern.
  • The amplitudes of the waves must be equal. This improves contrast with Imax = 4 and Imin = 0.
  • The sources must be close to each other. Otherwise due to small fringe width (β ∝ 1/d) the eye can not resolve fringes resulting in uniform illumination.

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