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Wavelength in the visible spectrum most strongly transmitted

  1. Mar 26, 2015 #1
    1. The problem statement, all variables and given/known data
    A camera lens (n = 1.29) is coated with a thin film of magnesium fluoride (n = 1.71) of thickness 87.0 nm. What wavelength in the visible spectrum is most strongly transmitted through the film?

    2. Relevant equations
    λ = 2nt/m

    3. The attempt at a solution
    λ = 2(1.71)(87E-9m)/(1) = 297 nm

    Answer is not correct. Please point out the mistake. Thanks
  2. jcsd
  3. Mar 26, 2015 #2


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    Look at how the refractive indices are related at each surface.
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