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Homework Help: Thinnest film in which the reflected light will be a maximum?

  1. May 3, 2009 #1
    1. The problem statement, all variables and given/known data

    Monochromatic light, at normal incidence, strikes a thin film in air. If (lambda) denotes the wavelength in the film, what is the thinnest film in which he reflected light will be a maximum?

    2. Relevant equations

    2d = (m+1/2)(lambda/nfilm) for minimal reflection and

    2d = m(lambda/nfilm) for max reflection

    3. The attempt at a solution

    I used the second formula above:

    2d = m(lambda/n) and solved for d;
    I got d = lambda/2n , but someone else in my class says it is lamba/4n,

    Can anyone offer any insight? Thanks!!
  2. jcsd
  3. May 4, 2009 #2
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