Specular Reflection from a Reflection Diffraction Grating

  • Thread starter Crumbles
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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?
 

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Crumbles said:
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?
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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