hand written solution required

6) The antenna of a transmitter in UHF-range consists of an array of several synchronized sources with an equal distance between adjacent sources. Each of them transmit circular wave. i.e., the wavefronts torm concentric cylinders. Let the number of sources be M and the distance between adjacent sources be d. The observation angle with respect to the line through the center of the array in perpendicular direction is denoted by 0 and the wavelength is denoted by A. a) Using the terminology of diffraction grating. what would be the condition for just the zero'th order diffraction maximum. and what would be the use of this? b) Determine the angular width of the (i'h order interference maximum, as 44:13.25 m, d=0.125 m and N=6