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  4. The figure represents a wavefront emanating from point source. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/9d33db10a1f56def8446579e018d2b58-.png /> The amplitude of point P and Q on the wavefront is

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Q. The figure represents a wavefront emanating from point source.
image
The amplitude of point $P$ and $Q$ on the wavefront is

Wave Optics

Solution:

If we have a point source emitting waves uniformly in all directions, then the locus of points which have the same amplitude and vibrate in same phase are spheres.