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  4. If a torch is used in place of monochromatic light in Young's experiment what will happen?

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Q. If a torch is used in place of monochromatic light in Young's experiment what will happen?

NTA AbhyasNTA Abhyas 2022

Solution:

No fringe will appear, when we used torch in place of monochromatic light because waves reaching at any point on the screen do not have a constant phase difference, as phase difference due to different colours changes randomly. Therefore, maxima and minima would also change their positions randomly and in quick succession. This will result in general illumination on the screen.