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In Young's double slit experiment, an in...

In Young's double slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 `overset(circ)(A)` coming from the coherent sources `S_(1) and S_(2)`. At certain point P on the screen third dark fringe is formed. Then, the path difference `S_(1) P – S_(2) P` in micron is

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