APFIVE Thin Film Interference and Refractive Index
A physicist observes that when white light reflects from a thin film of benzene (n = 1.50) on a surface, blue light (λ = 450 nm) is absent in the reflection. If the film thickness is 75 nm, what is the index of refraction of the surface beneath the benzene?
A
Exactly 1.00
B
Greater than 1.50
C
Cannot be determined from the information given
D
Less than 1.50
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