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Question: Answered & Verified by Expert
Two sources are said to be coherent if they produce waves
PhysicsWave OpticsKCETKCET 2009
Options:
  • A having a constant phase difference
  • B of equal wavelength
  • C of equal speed
  • D having same shape of wavefront
Solution:
2907 Upvotes Verified Answer
The correct answer is: having a constant phase difference
Phase difference $=\frac{2 \pi}{\lambda} \times$ (path difference)
The phase difference is independent of time and depends only on the path difference $\left(x_{2}-x_{1}\right)$. This holds only if the two sources are 'coherent', ie, they have a constant fixed phase difference between them.

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