So I know resolving power is given by : Resolvance = λ/Δλ = nN Where n = order of fringe being observed and N is the no. of slits. So I was thinking there are a few ways of increasing resolvance : 1.) Decrease the slit width 2.) Increase the order of the fringe we observe. 3.) Increase the number of slits. However, wouldn't the first option cause a decrease in transmitted light and hence wouldnt our spectra have decreasing intensity ? Also, for the second option, it is known that intensity of maximas decreases quite quickly from one order to the next... Hence, would our peak have poor intensity as well ?