Radiation-Emitting Products. Electromagnetic Compatibility (EMC) Electromagnetic compatibility, or EMC means that a device is compatible with (i.e., no interference is caused by) its electromagnetic (EM) environment and it does not emit levels of EM energy that cause electromagnetic interference (EMI) in other devices in the vicinity.
Storefront of a food shop. A storefront or shopfront is the facade or entryway of a retail store located on the ground floor or street level of a commercial building, typically including one or more display windows. A storefront functions to attract visual attention to a business and its merchandise. Before the middle of 19th century, shop fronts did not have large display windows, but often included features such as awnings and bay windows to attract the attention of passersby.
Wavefront. A wavefront is a surface or line in the path of wave motion on which the disturbances at every point have the same phase. Depending upon the source of light, wavefronts can be of three types: spherical wavefront, cylindrical wavefront and plane wavefront.Spherical Wavefront : If a point source in an isotropic medium is sending out waves in three dimensions, the wavefronts are spheres centered on the source as shown in figure.epending upon the source of light, wavefronts can be of three types: spherical wavefront, cylindrical wavefront and plane wavefront. Spherical Wavefront : If a point source in an isotropic medium is sending out waves in three dimensions, the wavefronts are spheres centered on the source as shown in figure.