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Is rainbow a prismatic spectrum or grating spectrum ?

  1. Mar 12, 2008 #1
    Is rainbow a prismatic spectrum or grating spectrum ?


    I think it is a grating spectrum as

    Deviation Order(violet least and red most) is same as that of grating
    Source is at infinity (sun)
    Image is at infinity
     
  2. jcsd
  3. Mar 12, 2008 #2

    NoTime

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  4. Mar 12, 2008 #3

    pam

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    A rainbow is not a grating spectrum.
    It is caused by refraction as the light passes in and then back out of each drop of water.
     
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