Point source diffraction through a slit

An exact solution is obtained for the problem of diffraction by a slit in an infinite absorbing sheet. The solution to this problem is obtained using the Wiener-Hopf technique. This consideration is important because point sources are regarded as better substitutes for real sources than line sources or plane waves. The effects of convection have been included for low Mach numbers, and a comparison is made of the diffraction in the far field for the cases of propagation in (a) still air and (b) moving air.