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Why can't sodium vapour lamp be used in spectrometer experiment

  1. Nov 14, 2009 #1
    i was working with a spectrometer and the aim of the experiment was to find the refractive index of a prism for various colors.
    i was asked specifically to use mercury vapor lamp and was insisted not to use sodium vapour lamp.
    why is it so?
     
  2. jcsd
  3. Nov 14, 2009 #2

    mgb_phys

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    How many colors are in a Na vapor lamp?
    How many in an Hg
     
  4. Nov 14, 2009 #3

    dlgoff

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    And the ones you can't see in Hg can be a eye safety concern. i.e. Ultraviolet.

    Hopefully precautions are being taken.
     
  5. Nov 15, 2009 #4
    sir can u please tell me the difference between the two spectra,interms of colors etc?
     
  6. Nov 15, 2009 #5

    dlgoff

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    FG04_03.jpg
    http://physics.uoregon.edu/~jimbrau/astr122/Notes/Chapter3_4.html" [Broken]
     
    Last edited by a moderator: May 4, 2017
  7. Nov 15, 2009 #6
    A wonderful illustration of why mercury is preferable to sodium.
     
    Last edited by a moderator: May 4, 2017
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