The two slits in Young's double slit exp...

The two slits in Young's double slit experiment are illuminated by two different sodium lamps emitting light of the same wavelength. No interference pattern will be observed on the screen.

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When the two slits of Young's double slit experiment are illuminated by two different sodium lamps, then the sources are not coherent and hence sustained interference pattern will not achieved. It will change so quickly that there will be general illuminated and hence interference pattern will no t be observed.

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