Abstract: It is discorered that circular hole diffraction and circular disk diffraction pattern in large aperture convergent beam are different from those of general Fresnel diffraction. The properties of large aperture convergent beam are studied experimentally and the phenomena explained using the method of geometric optics. The existence of inversion relation in these diffraction patterns is demonstrated. Utilizing convergent beam of large aperture can realize inversion of circular hole diffraction and circular disk diffraction.

Key words: large aperture convergent beam, circular hole diffraction, circular disk diffraction, inversion