Calcite, the most common form of natural calcium carbonate (CaCO3), a widely distributed mineral known for the beautiful development and great variety of its crystals.
A wavefront is a surface over which an optical wave has a constant phase. For example, a wavefront could be the surface over which the wave has a maximum (the crest of a water wave, for example) or a minimum (the trough of the same wave) value. The shape of a wavefront is usually determined by the geometry of the source.
A wavefront is a surface or line in the path of wave motion on which the disturbances at every point have the same phase.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.