So we did a diffraction grating lab where we pointed two types of lasers through a grating towards a white board and recorded a value (width of the slit) for single slits and d values for double slits and we also drew minimas from both sides of the central maxima for both double and single slits and measured the Y values between those minimas with a caliper and then did calculations. We used red and green lasers to find the double and single slit wavelengths. So what are some possible systematic errors in this experiment?