1. The problem statement, all variables and given/known data Ramon has a coherent light source with wavelength 554 nm. He wishes to send light through a double slit with slit separation of 1.5 mm to a screen 90 cm away. What is the minimum width of the screen if Ramon wants to display five interference maxima? 2. Relevant equations λ/s = w/D λ= wavelength (554nm - converted to 5.54e-4 mm) s= slit separation (1.5mm - provided by question) w= width between maxima (use 5w do to question asking for 5 interference maxima) D= distance to screen (90cm - converted to 900mm provided by question) 3. The attempt at a solution Given that three of the four variables are known values, this should be simple as plug and solve. For some reason it is not liking the answer I am providing. The left side of the equation is simply 5.54e-4 / 1.5 which one would set equal to 5w / 900. Where am I going wrong here? Thanks in advance!