Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source 
. The distance between the screen and the slits is 100 cm. If a bright fringe 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
A
B
2 nm
C
2.87 nm
D
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A
As 
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