1. The problem statement, all variables and given/known data Light of wavelength 6000Å illuminates a single slit of width 10-4m. Calculate the angular spread of first diffraction minima. 2. Relevant equations d*y/D = nλ Y = nλ/a for minima Y = (2n±1)λ/a for maxima Y stands for the position on screen, d is slit width and D is separation between screen and slit. 3. The attempt at a solution I understand that the angular spread of any maxima is the difference in the angles subtended by the two minima on either side of it. But what about angular spread of a minima? Is it the difference in the angles subtended by the two maxima on its either side?