Diffraction by a Smooth Transparent Object. II. Diffraction by a Cylindrical Cavity

The exact solution corresponding to the field produced by a time‐harmonic line source in the presence of a circular cavity of radius a(N < 1) is found and evaluated asymptotically for large ka. Upon comparing it with the geometric rays and the diffracted rays constructed in Chen, the coefficients, especially the diffraction coefficients, are thus determined.