1. The problem statement, all variables and given/known data What is the slit width? Wavelength is 635 nm. Distance between screen and slit, 2.5 m. Distance on screen between first and second minima above the central maxima is delta 6 mm. 2. Relevant equations D* sin theta * = m * lambda tan theta = x/ distance between screen and slit 3. The attempt at a solution I set lambda/sin theta m2-sin theta m1= 2*lambda/ sin theta m2 tan theta 2m = x + 6 *10^-3 m/2.5 I tried to plug it in, but i got stuck. What's the correct approach?