The Kirchhoff [KEER-kawff] equation can be approximated by the Fraunhofer type of this phenomenon, which was observed in Young's double slit experiment. When the observer is close to the obstructing surface, its Fresnel type 
The Kirchhoff [KEER-kawff] equation can be approximated by the Fraunhofer type of this phenomenon, which was observed in Young's double slit experiment. When the observer is close to the obstructing surface, its Fresnel type occurs. When it manifests as (*) scattering, Bragg's law describes this phenomenon in crystals. Huygens' [HOY-ginz'] principle describes every point on a wave front as a source of, for 10 points, what phenomenon of waves bending around obstacles?
The Kirchhoff [KEER-kawff] equation can be approximated by the Fraunhofer type of this phenomenon, which was observed in Young's double slit experiment.
diffraction (accept word forms)