1. The problem statement, all variables and given/known data Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.58m from the grating. In the first-order spectrum, maxima for two different wavelengths are separated on the screen by 3.16 mm . What is the difference between these wavelengths? 2. Relevant equations d*sinΘ=mλ 3. The attempt at a solution d = 1/90000 = 1.111*10-5 d*sin(Θ1)=λ1 and d*sin(Θ2)=λ2 using subtraction d*ΔsinΘ=Δλ (and using small angle approx d*ΔΘ=Δλ) But im not sure how to find ΔΘ (or how even to visualize ΔΘ) thanks in advance.