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UAPhys03
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Homework Statement
7: a: A thin film of oil (n2=1.2 and t(thickness) = 600nm) lies on top of some water (n3=1.33) after spilling from an oil tanker. What wavelengths of visible light would be bright in reflection? use n1 = 1 (air)
Homework Equations
CI (constructive interference): 2t = (m+1/2)Lambda
DI (destructive interference): 2t = mLamda
Lamda = Lamda/n
Layers of film
air= n1
oil = n2
water = n3
The Attempt at a Solution
The problem asks for the bright areas so I used the constructive interference equation. my set it up as one part of the wave being completely reflected while another part of the wave refracted into the oil and then is reflected by the water and refracted into the air. I can't figure out what to do next.
The answer is: (720nm, 480nm)