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of 4.2 mm from the centre of the interference
In a biprism experiment, interference
fringes are observed on the screen placed at a
distance of 1 m from the slits illuminated by a
monochromatic light of wavelength 4200 A.U.
The distance between the slits is 2 mm. A
point 'P' is situated on the screen at a distance
pattern. Is the point P' bright or dark ?

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