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AP Physics 2
14.8 Double-Slit Interference and Diffraction Gratings
AdvancedMCQGraphicalMathematicalConceptual23.9k
A 2D Cartesian plot showing relative intensity on the vertical axis versus position y on the horizontal axis. The vertical axis is labeled I and has no grid lines. The horizontal axis is labeled y and features five tick marks symmetrically arranged about the origin: -2y_1, -y_1, 0, y_1, and 2y_1. A solid curve depicts a smooth, periodic interference pattern with broad peaks of equal maximum height located precisely at y = -2y_1, -y_1, 0, y_1, and 2y_1. The curve reaches zero intensity at the midpoints between adjacent peaks, specifically at y = -1.5y_1, -0.5y_1, 0.5y_1, and 1.5y_1. There are no secondary peaks between the main peaks. No other labels, lines, text, or axes appear.
Intensity pattern for the two-slit barrier with slit spacing d.
A monochromatic laser beam of wavelength \(\lambda\) is incident normally on a barrier containing two narrow slits separated by a center-to-center distance \(d\). The resulting light intensity pattern observed on a distant screen is shown in the graph, where \(y\) is the position along the screen and \(y_1\) is the location of the first-order principal maximum. The two-slit barrier is then replaced with a four-slit barrier having the exact same slit width and center-to-center slit spacing \(d\). Which of the following graphs best represents the new light intensity \(I\) on the screen as a function of position \(y\)?

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