A single-slit diffraction pattern is formed by monochromatic electromagnetic radiation from a distant source passing through a slit 0.105 mm wide. At the point in the pattern 3.250 from the center of the central maximum, the total phase difference between wavelets from the top and bottom of the slit is 56.0 rad.
(a) What is the wavelength of the radiation?
(b) What is the intensity at this point, if the intensity at the center of the central maximum is I0?