Question:

Two sources of light are said to be coherent when both give out light waves of the same

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Coherent sources are essential for interference — they must have the same wavelength and a constant phase difference to produce a steady interference pattern.
Updated On: July 22, 2025
  • amplitude and phase
  • intensity and wavelength
  • speed
  • wavelength and a constant phase difference
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The Correct Option is D

Solution and Explanation

For two light sources to be coherent, they must emit waves having the same wavelength and maintain a constant phase difference over time.
This ensures stable and observable interference patterns.
Amplitude, speed, or intensity can differ, but coherence strictly requires a fixed phase relationship.
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