Assertion (A) : The phase difference between any two points on a wavefront is zero.
Reason (R) : All points on a wavefront are at the same distance from the source and thus oscillate in the same phase.

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A is ture, but R is false

Both A and R are true and R is the correct explanation of A

Both A and R are true, but R is not the correct explanation of A

Both A and R are false

answer is B.

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Detailed Solution

From a source if all the waves travel same distance x then there phase changes by $\frac{2 π x}{λ}$ is same for all the waves, Wavefront is the locus of all the points having same phase.

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