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Question
Assertion (A): Two light sources emitting waves of similar wavelengths are coherent.
Reason (R): Two light sources emitting waves having zero or constant phase difference are known as coherent sources.
Options
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
Both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Assertion is true but Reason is false.
Both Assertion and Reason are false.
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Solution
Both Assertion and Reason are false.
Explanation:
Assertion is false because two light sources having only similar wavelengths are incoherent. Coherence requires the same frequency and a constant phase difference over time.
Reason is false because it is incomplete,coherent sources must have both the same frequency and a constant phase difference, not just “zero or constant phase difference”.
