What role do wavelets play according to Huygen's Principle?

Wavelets play a crucial role in the context of Huygen's Principle by helping to generate the resultant wavefront. Huygen's Principle states that each point on a wavefront serves as a source of secondary wavelets, which spread out in all directions at the same speed as the original wave. These secondary wavelets interfere with one another to create a new wavefront. Thus, the combined effect of these wavelets results in the formation of the overall wavefront that moves through space.

The concept of wavelets in this context emphasizes how the overall propagation of waves can be understood by considering the contributions from countless smaller wavelets. This principle is fundamental in understanding wave behavior and propagation in various media, which is vital in sonography as it pertains to sound wave transmission and image formation.