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.
wave front - (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium. wavefront. natural philosophy, physics-the science of matter and energy and their interactions; his favorite subject was physics.. wave front-all the points just reached by a wave as it propagates. propagation-the movement of a wave through a medium. wave-a persistent and widespread unusual weather condition (especially of unusual temperatures); a heat wave.