Answer :


Distance between slits(d) = 1 mm = 10-3 m

Distance from screen(D) = 1 m

Wavelength of light used(λ) = 500 nm = 5 x 10-7 m

Therefore, from results of Young’s double slit experiment,

fringe separation(β) = = 5 x 10-4 m = 0.5 mm. (Ans)

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