Two slits are made one millimeter apart and the screen is placed one metre away. When blue-green light of wavelength 500 nm is used, the fringe separation is
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Here, `d = 1 mm = 10^(-3)m D = 1m`, `lambda = 500 nm = 500 xx 10^(-9)m = 5 xx 10^(-7)m` Fringe separation = fringe width, `beta = ?` `beta = (lambda D)/(d) = (5 xx 10^(-7) xx 1)/(10^(-3)) = 5 xx 10^(-4)m = 0.5 nm`
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