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Anti-Reflecting coatings on a glass lens

  1. Mar 5, 2006 #1
    heres the question:

    anti-reflection coatings on a glass lens (n=1.50) consists of a magnesium fluoride (n=1.38) film, the coating thickness is chosen to eliminate any back reflectionusing the ideas of destructive interference. What is the minimum coating thickness required to eliminate the reflection from a helium-neon laser at 632.8nm? Should the coating be the same thickness on both the front and rear faces of the lens?

    really don't have a clue where to go with this one, looked all through my notes for this and can't find anything on coatings, if someone could just point me in the right direction i should be able to do it? thanks
  2. jcsd
  3. Mar 5, 2006 #2
    thin film interference....
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