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Specular Reflection from a Reflection Diffraction Grating

  1. Mar 21, 2005 #1
    I understand that a laser beam shining onto a diffraction grating produces a 0th order, 1st order etc... diffracted beam. My question is: What is the wavelength of the specular reflection [0th order beam] off the grating in regards to the wavelength of the incident beam?
     
  2. jcsd
  3. Mar 24, 2005 #2
    the "zeroth order" is just like an ordinary mirror - thus if it in not moving, there is no change in wavelength, and no dispersion, and for this reason it is sometimes called the "white light order"
     
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