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A Newton's ring

  1. Feb 15, 2017 #1
    Why the center of newton's ring is dark? though I am thinking the path difference in the center is zero between two reflected rays...
    so,I will be glad if u give the correct information about that...
     
  2. jcsd
  3. Feb 16, 2017 #2

    Orodruin

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    As long as the surfaces are in contact the path difference in the middle is zero. If you move them slightly apart you can change this.
     
  4. Feb 16, 2017 #3

    ehild

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    The phase difference between the two reflected ways counts, and it is not zero, even in the case when the path difference --->0.
     
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