This is probably really sad that I am posting about this. I am doing my Modern Lab on Spectroscopy of Hydrogen and Sodium. I am confused on what exactly n is. We used this apparatus which spun on a 360degree vernier scale, we were able to view the 4 wavelengths of Hydrogen twice and the doublets of Sodium also twice. I do not completely understand what n is. From my understanding which may be incorrect the different colors of light viewed are a result of different excitation states? going from one energy level to the next? So on a diagram you see an increasing E and increasing n you see the eV increase. But on a diffraction setting, n is the location of occurrences of maxima/minima right? So... I'm not sure what exactly it means with the equation nλ=dsinθ I mean, one order you can see the four visible light (red, blue, violet, violet) and then the next order you can see them again? Yeah please enlighten me.