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Newton rings ?

  1. Mar 26, 2008 #1
    Below is the picture of a newton rigns experiment but u can see the rings at the lens surface outside the apparatus , what is the reason for these fringes to occur ?

    fu9zcj.jpg

    The pic was taken with a mobile camera (2MP)

    1st explanation :I think this is like two virtual sources of fresnel biprism , here the lens is ciruclar so the light from sodium lamp strikes it & there must be something inside the lens that produces these fringes .

    2nd explanation : Light travels thru glass plate from fringes formed in apparatus & intereferes at the lens of camera with the direct light come from sodium lamp & both r in same phase to give interference pattern .

    I am more in favour of my 1st thought , what do u guys think ??
     
    Last edited: Mar 26, 2008
  2. jcsd
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