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AP Physics 2
14.8 Double-Slit Interference and Diffraction Gratings
14.7 Diffraction
AdvancedMCQProportional AnalysisConceptual22.9k
Double-slit setup showing individual slit width \(a\), slit separation \(d\), and screen distance \(L\).
Double-slit setup showing individual slit width \(a\), slit separation \(d\), and screen distance \(L\).
A monochromatic laser of wavelength \(\lambda\) is incident normally on a double slit where each individual slit has a width \(a\) and the center-to-center separation between the two slits is \(d\), with \(d > 2a\). An interference pattern modulated by a single-slit diffraction envelope is observed on a screen placed a distance \(L\) away, where \(L \gg d\). If the apparatus is modified such that the individual slit width \(a\) is doubled to \(2a\) and the slit separation \(d\) is halved to \(d/2\), which row in the table correctly indicates the resulting changes to the pattern on the screen?

| Row | Width of Central Diffraction Maximum | Distance Between Adjacent Interference Fringes | Number of Bright Fringes in Central Maximum |
| :--- | :--- | :--- | :--- |

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