Main Page | See live article | Alphabetical index In electromagnetic wave propagation, the knife-edge effect is a redirection by diffraction of a portion of the incident radiation that strikes a well-defined obstacle such as a mountain range or the edge of a building. Note: The knife-edge effect is explained by Huygens' principle, which states that a well-defined obstruction to an electromagnetic wave acts as a secondary source, and creates a new wavefront. This new wavefront propagates into the geometric shadow area of the obstacle. Source: from Federal Standard 1037C in support of MIL-STD-188 This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.