1. The problem statement, all variables and given/known data I need to measure (with the ruler) the width the depicted sinc envelope and the period of the depicted Dirac comb light pattern. And from the above I need to calculate the width of one slit a (i.e. aperture width) of the grating, and the period of the grating dx (i.e. distance between each slit). I have no idea where to start :( 2. Relevant equations 3. The attempt at a solution I suck at physics and spent few hours reading everything I could find on the internet on convolution, diffraction and fourier theorem. I still have no clue what I need to measure!