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Double-slit experiment: overlapping fringes (two wavelengths)

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In a setup of Young's double slit-experiment, a beam of light containing a red wavelength, λ1=650 nm, and a violet wavelength, λ2=390 nm, create red and violet fringes on the screen.
The ratio, Dd=8000.
What is the least distance from the central maximum where a red bright fringe overlaps with a violet bright fringe?
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