Identify the condition which is not necessary for two light waves to be coherent.

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Class 12 Physics Practice Test: Huygen's Principle — practice the complete quiz, review flashcards, or try a random question.

The Huygens–Fresnel principle states that every point on a wavefront is itself the source of spherical wavelets, and the secondary wavelets emanating from different points mutually interfere. The sum of these spherical wavelets forms a new wavefront.


Identify the condition which is not necessary for two light waves to be coherent.