Interference
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Interference

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Interference Presentation Transcript

  • 1. interference
  • 2.
    • Conditions for interference
    • Sound waves
    • Light waves
    • Young’s double slit experiment
  • 3. Conditions for interference
    • All waves exhibit interference
    • Constrictive
    • Destructive
    • For Interference:
      • The sources must be coherent.
      • The sources should be monochromatic
  • 4. Sound waves
  • 5.
    • Sound waves leave speakers in phase
    • Relative phase along XY depends on distance travelled
    • Maximum if path difference = n 
    • Minimum if path difference = (n + ½) 
  • 6. Light waves
    • V. rare to observe light interfering to produce dark region
    • Usually random polarisation and phase
    • Hence no steady interference pattern
    • 1801: Young produced double slit experiment
  • 7.  
  • 8.  
  • 9.
    • Light bands = maxima – due to constrictive interference
    • i.e. path difference = n 
    • Distance between maxima, w depends on:
          • Slit separation, s
          • Wavelength of light, 
          • Distance, D between slits and screen
    •  = ws
    • D