A 40 mm wide diffraction grating is made up of slits with a seperation of 7.5*10^(-6) m. A broad beam of light of wavelength 580 nm is incident on the grating at an angle of 20 degrees.
a) What angles do the plus and minus first order diffracted beams make with the direction of the zero-order transmitted beam?
b) What is the minimum resolvable bandwidth in the first order beams?