Tuesday, December 7, 2010

11.3 Diffraction

  • Define diffraction  - Diffraction is the change in shape of a wave as it passes through a gap or a slit. Maximum diffraction occurs when the width of the gap is equal to the wavelength of the wave.



  • Explain the diffraction pattern when light passes through a slit and is projected onto a screen using Huygens model 
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The diffraction pattern is when the wavelength passes through a gap which causes
An infinite amount of point sources along the wave front and each of those produce a
Secondary wave.


 
  • Sketch the first three minima the relationship between the angle of diffraction and relative intensity when light passes through a single slit
    • Add to each of the minima the equation relating the angle of the minima to the wavelength and slit width
    • derive the formula θ = λ/b
    • What assumption was made in the derivation of θ = λ/b
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