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AP Physics 2
14.8 Double-Slit Interference and Diffraction Gratings
IntermediateMCQProportional Analysis16.9k
A horizontal optical setup viewed from above. On the left, light from two lasers passes through a barrier with two narrow slits separated by distance d. The light travels to a screen at distance L on the right. On the screen, a central axis is marked, and the second-order bright fringe for violet light is located at distance y_V above the central axis. No other labels, lines, text, or axes appear.
Double-slit setup illuminated by red and violet laser light.
A red laser with wavelength \(\lambda_R = 600 \text{ nm}\) and a violet laser with wavelength \(\lambda_V = 400 \text{ nm}\) simultaneously shine through a double slit onto a screen located a distance \(L\) away. On the screen, the second-order bright fringe for the violet light is located at a distance \(y_V\) from the central bright fringe. Assuming the small-angle approximation holds, what is the distance from the central bright fringe to the second-order bright fringe for the red light?

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