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mrx35g
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Homework Statement
an oil stick 122 nm thick (n=1.40), lying on water, is illuminated by white light incident perpendicular to it's surface. What is the wavelength of the color that appears?
Homework Equations
I'm not sure, but i tried n= Lambda(air)/Lambda coating in order to find the lambda in air but it doesn't match.
The Attempt at a Solution
I used the above equation but it didn't work. I'm also having a hard time grasping the concept of index of refraction and how it's related to the thin films. Any strong analogy that you can give me as a tool to understand the concept will be more than helpful to me.