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Paragraph I: In a Young's double slit experiment, each of the two slits A and B, as shown in the figure, are oscillating about their fixed center and with a mean separation of 0.8 ~mm . The distance between the slits at time t is given by d=(0.8+0.04 t) mm , where =0.08 rad s ⁻¹ . The distance of the screen from the slits is 1 ~m and the wavelength of the light used to illuminate the slits is 6000 Ã… . The interferen

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aligned & y=n ( D d ) & for 8^ th fringe & y=8 D d & y_ =8 D d_ & y_ =8 D d_ & y_ -y_ =8 D [ 1 d_ - 1 d_ ] & =6000 Ã… aligned aligned & D =1 ~m & ~d _ =0.34 ~mm & ~d _ min =0.76 ~mm & y_ -y_ =8 6000 10⁻¹⁰ 1 [ 1 0.76 10⁻³ - 1 0.84 10⁻³ ] & =8 6 10⁻⁴ [ 0.08 0.76 0.84 ]=601.5 m & aligned (answer range is from 598 to 602 )

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