Wavefront is defined as the locus of all the particles of a medium vibrating in the same phase at a given instant. The phase difference between any two points situated on the same wave front is zero the shape of a wavefront depends upon the shape of the source of disturbance. There are different types of wavefronts which are given below
If the source disturbance is a point source (O), then the wavefront is spherical.
If the source of disturbance is a slit AB (i.e. line source) then the wavefront is cylindrical because all the points equidistant from the source lie on the surface of the cylinder.
At a very large distance from the point source, a small part of the spherical wavefront appears plane and this part of the spherical wavefront is called plane wavefront. Thus, a spherical wavefront appears as plane wavefront after traveling a large distance from the point source.
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