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Both no 6a is correct✅✅✅

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(6a) 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.

(6b)types of
wavefronts

– Spherical wavefront:-
If the source disturbance is a point source (O), then
the wavefront is spherical.

-Cylindrical wavefront:-
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.

-Plane wavefront:-
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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