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In a special arrangement of Young's double - slits d is twice the distance between the screen and the slits D, i.e. d = 2D. For the setup, the value of D such that the first minima on the screen fall at a distance D from the centre O is found to be `(lambda)/(N)`, where `lambda` is the wavelength of light used. What is the value of N ? `["Take "sqrt5=2.24]`

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