1. The problem statement, all variables and given/known data The angle to eighth maximum is 1.12. θ_m=1.12 The distance from the slits to the screen is 3.02m. L=3.02m The distance between the slits is 0.00025m. d=0.00025m The distance from the first minimum to the fifth minimum is 0.095cm. 0.0295/4=Δx=0.007375m λ=? 2. Relevant equations λ=dΔx/L λ=dsinθm/m λ=dxn/L(n-1/2) λ=dxm/Lm λ=dsinθn/L(n-1/2) 3. The attempt at a solution So, I have to calculate the wavelength three different ways, and so far I've managed to find two. The two equations I've used to calculate the wavelength are λ=dsinθm/m and λ=dΔx/L. I just need to find another equation to calculate the wavelength. I wanted to use the equation λ=dxn/L(n-1/2) or the equation λ=dxm/Lm, but I don't know how to calculate xn or xm. So basically, I just need to find another equation to calculate the wavelength and so far, I've been wanting to know how to calculate xn or xm. I think I may need to use the equation xn=λL/2d to calculate x, but I don't have λ, so I can't calculate it that way. Any hints would be much appreciated!