In a Young's double slit experiment two slits are separated by 2 mm and the screen is placed one meter away. When a light of wavelength 500 nm is used, the fringe separation will be :

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β = λ D d = 500 × 10 - 9 × 1 2 × 10 - 3 β = 5 2 × 10 - 4 m = 2 . 5 × 10 - 1 mm b = 0 . 25 mm

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