Task: Text Categorization
Input (English): This phenomenon is used in a technique that uses a phosphor screen and a CCD camera in the specimen chamber of a scanning electron microscope, which images the kikuchi bands of its "backscatter" form. In one form of this phenomenon, crystal size is proportional to shape factor over line broadening. With X-rays, it is described by the Scherrer equation and Bragg's law. If the coherence length is smaller than another measure, then two single-slit patterns of this phenomenon overlaid is the same as the double-slit pattern, unlike the interference found by Young. For 10 points, name this optical event in which light propagates past an obstacle, resulting in complex patterns.
Output (English): Science