1. The problem statement, all variables and given/known data A beam of light of unknown wavelength is incident on a screen with a single-slit. Observing the interference pattern on the projection screen that is 1.7 m away, the 4th minimum is 27 cm away from the central line. The width of the slit is 15 μm. a) What is the wavelength (in nm) of the light used? b) How wide(in cm)is the central maximum? 2. Relevant equations Single slit equations 3. The attempt at a solution I plugged everything in, stuck on the first step. Xn= n*Lλ/w = 4*1.7λ/1.5x10-5 Help?