What is a wavefront? How is it related to the rays of light ? What is the shape of a wavefront at a point faraway from the source of light ?

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Solution

Dear student
A Wavefront is defined as the locus of points which are in the same phase (a line or a surface) for a wave propagating by a source of disturbance
Wavefronts are always perpendicular to rays of light.
For a point far away from source of light wavefront is planar in shape as rays are parallel to each other.
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What is the shape of the wavefront in each of the following cases:
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