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 solution to the 2D wave equation. The wave equation is an important second-order linear hyperbolic partial differential equation for the description of wavesâas they occur in physicsâsuch as sound waves, light waves and water waves. It arises in fields like acoustics, electromagnetics, and fluid dynamics.