Wavefront means

Wavefronts

Draw the sktches to differentiate btween plane wavefront and spherical wavefront.

Wavefront and Huygens principle

For point source, the wavefront is

When source is linear, the wavefront is

As a spherical wavefront propagates, the amplitude (a) of a spherical wavefront varies with the distance r of the source

When wavefronts pass form denser medium to rarer medium the width of the wavefront