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Reflection maximum of material

  1. Dec 1, 2014 #1
    1. The problem statement, all variables and given/known data
    A coating of n1 = 1.33 material is to be added to n2 = 1.50 glass, in order to make it "irridescent."
    a) What is the thinnest layer of material which will have a reflection maximum for normal-incidence light at BOTH 400 and 600 nm (vacuum) wavelength?
    b) This thickness will have a reflection minimum at some wavelength between 400 and 600 nm. What is the wavelength of the reflection minimum?

    n1 = 1.33 (coating)
    n2 = 1.50 (glass)

    3. The attempt at a solution

    I drew a diagram, but I don't know how to begin to go about this problem. Can someone please guide me?
    I also know there's a 180 phase change because n2 > n1.
  2. jcsd
  3. Dec 1, 2014 #2


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    2017 Award

    Staff: Mentor

    You get interference between light that gets reflected at the first surface and light that gets reflected at the second surface. They need a special relationship to give the properties you want.
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