Not sure on how to calculate the 1st order angles

Use the equation on page 2 to calculate the 1st order angles for the theoretical hydrogen emission spectra for both diffraction gratings. Reminders: in the 1nt order spectrum, n=1. For the 300 lines /mm grating, a=3333nm. For the 600 lines /mm grating, a=1667nm. Make sure the units cancel out correctly. Prepare a table that looks like the following: =nasin