Why two light sources are called coherent?
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Two independent light source cannot act as coherent sources. Two sources of light are said to be coherent if they emit light which always has a constant phase difference between them. It means that the two light sources must emit radiations of the same wavelength.
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ANSWER
If two sources are said to be coherent if they have exactly same frequency and have zero or constant phase difference.
Example= Sun light
hope it helps ☺️
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