What is the longest wavelength λ of light that will exhibit constructive interference at normal incidence? the keratin layers are thin enoug

Question

What is the longest wavelength λ of light that will exhibit constructive interference at normal incidence? the keratin layers are thin enough that you can think of them as representing the surfaces of a 200-nm “film” of air?

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Ngọc Khuê 6 months 2021-07-26T08:24:17+00:00 1 Answers 6 views 0

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    2021-07-26T08:25:30+00:00

    Answer:

    560nm

    Explanation:

    You can use the following expression for thin films:

    \lambda=\frac{2nd}{m}

    where n is the index of refraction, d is the thicknes of the thin film and m is the order of the diffraction pattern. For keratin layers we can use n=1.40. For the longest wavelenth we use m =1.

    Hence, we obtain:

    \lambda=\frac{2(1.40)(200nm)}{1}=560nm

    HOPE THIS HELPS!!

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