46. A thin film of oil with a thickness of 90 nm rests on top of a pool of water. When white light incident on the film is reflected, what colors are seen? The refractive index of the oil is noil = 1.45.
This is my best attempt, just wondering if I was right. Any help would be appreciated.
2d = (m + ½)(λ /noil) (m = 0, assuming the minimum thickness)
(n air < n oil > n water) → the wave is inverted on the first reflection and not on the second reflection
[d = λ/4(noil) ] → 90nm = λ/4(1.45)
λ = 522 nm
According to wavelengths of visible light: Green = 520 - 565 nm
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