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'Two Independent Monochromatic Sources of Light Cannot Produce a Sustained Interference Pattern'. Give Reason. - Physics

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'Two independent monochromatic sources of light cannot produce a sustained interference pattern'. Give reason.

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Solution

The condition for the sustained interference is that both the sources must be coherent (i.e. they must have the same wavelength and the same frequency, and they must have the same phase or constant phase difference).

Two sources are monochromatic if they have the same frequency and wavelength. Since they are independent, i.e. they have different phases with irregular difference, they are not coherent sources. 

Concept: Refraction of Monochromatic Light
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