A laser with wavelength d8 is shining light on a double, Ask an Expert

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A laser with wavelength d/8 is shining light on a double slit with slit separation 0.400mm . This results in an interference pattern on a screen a distance L away from the slits. We wish to shine a second laser, with a different wavelength, through the same slits.

What is the wavelength %u03BB2 of the second laser that would place its second maximum at the same location as the fourth minimum of the first laser, if d = 0.400mm?

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