1. The problem statement, all variables and given/known data Monochromatic light with a frequency of 5.50 x 10^14 Hz is directed onto a diffraction grating ruled with 6000 lines/m. What is the distance between the third bright line and the fifth dark line of the interference pattern formed on a screen 2.50m from the grating? 2. Relevant equations wave length = dx/nL Answer: 0.0123m 3. The attempt at a solution wave length = 5.454545454545455e-7 d = 1/6000 = 1.666666667e-4 x = ? n = ? L = 2.50m I have an exam on this tomorrow and I can't even do simple questions like these. If somone can explain how i would solve this it would be great.