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AP Physics 2
14.9 Thin-Film Interference
BeginnerMCQMathematical17.1k
A horizontal thin layer labeled oil of uniform thickness t sits between air above and water below. A vertical incoming light ray from the air region strikes the top boundary of the oil layer. One reflected ray goes upward from the top boundary back into air. A transmitted ray goes into the oil layer, reflects off the bottom oil-water boundary, and exits upward into air parallel to the first reflected ray. Labels show n_air = 1.00 in the upper region, n_oil in the middle film region, n_water in the lower region, and thickness t on the side. No other labels, lines, text, or axes appear.
Reflection of light from the top and bottom surfaces of a thin oil layer on water.
A thin layer of oil with index of refraction \(n_{\text{oil}}\)

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