show Representation, Initial equations, Algebra work (only symbols), Units check, and Numerical answer. Electromagnetic radiation with wavelength strikes a diffraction grating that has a = 500 slits/mm. On a screen located L = 4.0 m from the grating, the third-order fringes (m = +3 and m = 3) are located x = 35 cm apart. What is ? For the representation, make sure that you include at least the first 3 orders of bright fringes, and a rough illustration of the intensity distribution of the interference pattern