What is a wavefront?

What is wavefront ? What is the shape of the wavefront at a point far away from the source of light?

What is wavefront?

What is wavefront of a wave?

Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the wavefronts emerging from the final image?

What is meant by a wavefront?What is the shape of the wavefront of a beam of parallel rays?

Wavefronts

A wavefront is

What do you understand by a wavefront?