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Interference fringes are observed on a...

Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source `(lambda=632.8 nm)`. The distance between the screen and the slits is 100 cm. If a bright fringes is observed on a screen at a distance of 1.27 mm from the central bright fringe , then the path difference between the waves , which are reaching this point from the slits is close to :

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