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Homework Help: Thin Lenses

  1. May 2, 2009 #1
    1. The problem statement, all variables and given/known data
    Light of wavelength 640 nm in water illuminates a glass (n = 1.5) wedge submerged in water (n = 1.33). If the distance between successive bright fringes is 6 mm.

    2. Relevant equations

    3. The attempt at a solution
    I have a lot of trouble trying to convert the wavelength of light into the wavelength of water...but the rest i pretty much understand, just that little part that is really frustrating me.
  2. jcsd
  3. May 3, 2009 #2

    Doc Al

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    Staff: Mentor

    You mean convert the wavelength of light in one medium to the wavelength it would have in another.

    It's easiest if you always compare the wavelength in a medium to the wavelength in vacuum (n = 1). λn = λ/n. So, 640 nm = λ/1.33. To find the wavelength in glass, you need to figure out λ/1.5.
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