A wavefront is an imaginary surface where :

phase is same for all points

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phase changes at constant rate at all points along the surface

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constant phase difference continuously changes between the points

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phase changes all over the surface

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Solution

The correct option is B phase is same for all points
A wave front is the locus of points having the same phase.
Hence option A is correct.

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A wavefront is an imaginary surface where :

The correct option is B phase is same for all pointsA wave front is the locus of points having the same phase.Hence option A is correct.

The correct option is B phase is same for all points
A wave front is the locus of points having the same phase.
Hence option A is correct.