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The Atomic Spectrum

  1. Apr 28, 2013 #1
    When doing an experiment in order to observe the atomic spectra of some gas. We observe while peaking through the diffraction grating, symmetrical lines starting from n=1. Where does this symmetry arise from? Why do we see the same spectrum repeated on both, left side and right side. As if there was a mirror instead of the gas tube that reflected the first spectrum to the opposite side.

  2. jcsd
  3. Apr 28, 2013 #2


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    Staff: Mentor

    The setup is symmetric, there is no reason why the lines should be asymmetric.
  4. Apr 29, 2013 #3
    Thank you for your reply.
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