In the figure, first-order reflection from the reflection planes shown occurs when an x-ray beam of wavelength 0.420 nm makes an angle 0 = 63.1 with the top face of the crystal. What is the unit cell size ao? X rays ao -ao Number i Units A diffraction grating 16.4 mm wide has 5020 rulings. Light of wavelength 511 nm is incident perpendicularly on the grating. What are the (a) largest, (b) second largest, and (c) third largest values of 0 at which maxima appear on a distant viewing screen? (a) Number i Units (b) Number i Units (c) Number i Units > > A diffraction grating is made up of slits of width 450 nm with separation 1200 nm. The grating is illuminated by monochromatic plane waves of wavelength = 930 nm at normal incidence. (a) How many maxima are there in the full diffraction pattern? (b) What is the angular width of a spectral line observed in the first order if the grating has 1200 slits? (a) Number i Units (b) Number i Units