APFIVE Thin Film Constructive Interference
A thin film of oil (n = 1.45) floats on water (n = 1.33). Light rays from air (n = 1.00) reflect from both the top and bottom surfaces of the oil film. For constructive interference to occur, the minimum thickness of the oil film must be:
A
λ/n
B
λ/4n
C
3λ/4n
D
λ/2n
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