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Homework Help: Soap film having index of refraction

  1. Nov 8, 2009 #1
    What is the minimum (non-zero) thickness of a soap film having index of refraction 1.46, with air on both sides, that transmits virtually 100% of 500 nm light incident along the normal?

    a. 345 nm.
    b. 86 nm.
    c. Any thickness transmits 100%.
    d. 172 nm.

    I used 5.0x10^-9m/(1.46x20 and got 1.71x10^-9 which would be d, 172 nm, but not according to sig figs, so did I do this right. I know the equation is for constructive interference but is that the same?

    Thanks for the help if you can!
  2. jcsd
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