We are looking at a narrow hydrogen lamp through a grating element. one of the lines in the hydrogen's spectrum has a wavelength of 656.45 nm. deuterium is hydrogen's isotope, and different isotopes emit light at slightly different wavelengths. the"same" line in deuterium's spectrum has a-656.27 what minimum number of slits n is required to resolve these two wavelengths in the second order? a. b. suppose we have a grating element with 500 slits/mm. find angular separation of these two lines - in the first order.