1. The problem statement, all variables and given/known data A laser with wavelength d/8 is shining light on a double slit with slit separation 0.300 . 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 λ2 of the second laser that would place its second maximum at the same location as the fourth minimum of the first laser, if d= 0.300 ? 2. Relevant equations dsinθ=mλ dsinθ=(m+1/2)λ λ1=d/8 <---- not sure about this one but problem statement suggests it. d=3*10-4m 3. The attempt at a solution sinθ=((m+1/2)λ1)/d where m=-4 sinθ=((m+1/2)λ2)/d where m= 2 set equal and i got -0.0525mm. im not sure where I'm misunderstanding but it could be my understanding of m values, reading the problem wrong or simply a misunderstanding of the whole question posed. Any takers?