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AP Physics 2
14.8 Double-Slit Interference and Diffraction Gratings
AdvancedMCQProportional AnalysisConceptual18.9k
A side-view schematic diagram showing a double-slit barrier on the left and a vertical screen on the right separated by a horizontal distance labeled L. The barrier contains two narrow slits separated by center-to-center distance d, with each slit having width a. Light rays travel horizontally from left to right through the slits. The region between the barrier and the screen is filled with a uniform light gray shading labeled oil with index n > 1. On the screen, a series of bright intensity peaks are displayed along a vertical axis labeled y. The distance between adjacent peaks is labeled \Delta y. No other labels, lines, text, or axes appear.
Double-slit apparatus immersed in transparent oil of index n.
A double-slit interference experiment is conducted in air using monochromatic light of wavelength \(\lambda_0\). The slits have separation \(d\) and individual width \(a\), where \(d > a\), and the pattern is observed on a screen at distance \(L\). The entire apparatus is then immersed in a transparent oil with index of refraction \(n > 1\). Which of the following correctly describes the change in the fringe spacing \(\Delta y\) on the screen and the change in the number \(N\) of bright interference fringes contained within the central diffraction envelope?

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