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AP Physics 2
14.9 Thin-Film Interference
IntermediateMCQMathematical16.4k
A horizontal layered diagram showing three regions from top to bottom. The top region is labeled air with index of refraction n_1 = 1. The middle region is a thin horizontal layer labeled thin film with thickness t and index of refraction n_f. The bottom region is labeled glass lens with index of refraction n_g. An incoming vertical light ray arrow points downward from air into the film, splitting into a reflected ray arrow pointing upward from the air-film interface and a transmitted ray continuing through the film, which then reflects upward from the film-glass interface. No other labels, lines, text, or axes appear.
Cross section of light incident on the coated lens.
A camera lens made of glass with index of refraction \(n_g\) is coated with a thin transparent film of index of refraction \(n_f\), where \(1 < n_f < n_g\). Monochromatic light with wavelength \(\lambda_0\) in air shines normally onto the coated lens. Which of the following expressions represents the minimum non-zero thickness \(t\) of the coating that minimizes reflection of this light?

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