We know that lightwave emitted from an ordinary light source undergoes abrupt phase changes in time intervals of the order of 10-10 s. Thus, the light waves coming out from two independent light sources will not have any fixed phase relationship and would be incoherent.
Class 12 Physics Chapter 10 Wave Optics Session 2024-2025.
State the reason, why two independent sources of light cannot be considered as coherent sources.
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Two independent sources of light cannot be considered coherent because coherence requires a fixed phase relationship between the waves. Independent sources generally emit light with random phases, causing interference patterns to fluctuate over time. This lack of consistent phase correlation means they are not spatially or temporally coherent, essential for producing stable interference effects.
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