Wavefronts

*️⃣ A wavefront is an imaginary line or surface that represents points of a wave that oscillate in phase.

For example, if you consider a wave in water, the crest of the wave (the highest point) at a given moment can be connected to form a wavefront. The shape of the wavefront depends on the type of wave source and the medium through which the wave is propagating.

Linear Wavefronts:

Occur when the wavefronts are straight lines.
These wavefronts are typically produced by a wave source that is long and straight, such as a long horizontal rod vibrating in water.
Linear wavefronts can also be an approximation of plane wavefronts when considering waves over a limited region.

Circular Wavefronts:

Circular wavefronts are formed by a point source of waves, where the wavefronts expand outwards in circles (in two dimensions).
A circular wavefront is produced by a point source, such as a small object vibrating in water.
The wavefronts are concentric circles centered on the point sour.