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AP Physics 2
14.8 Double-Slit Interference and Diffraction Gratings
BeginnerMCQProportional Analysis24.9k
A schematic diagram showing a double-slit experiment setup. On the left, a horizontal red beam labeled 'Laser' propagates to the right toward a vertical barrier containing two narrow horizontal slits separated vertically by a distance labeled \(d\). To the right of the barrier, at a horizontal distance labeled \(L\), stands a vertical screen. On the screen, a vertical series of alternating bright red dots and dark gaps represents an interference pattern. A vertical dimension line between two adjacent bright red dots near the center is labeled \(\Delta y\). Horizontal dashed lines extend from the slits to the screen to indicate the distance \(L\). No other labels, lines, text, or axes appear.
Double-slit interference setup.
A helium-neon laser illuminates two narrow slits separated by a distance \(d\), producing an interference pattern on a screen located a distance \(L\) from the slits. The distance between adjacent bright fringes near the center of the interference pattern is \(\Delta y\). If the setup is modified so that the slit separation is reduced to \(\dfrac{1}{2}d\) and the distance from the slits to the screen is increased to \(2L\), what is the new separation between adjacent bright fringes?

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