In a two slit experiment with monochromatic light, fringes are obta...

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In a two slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the slits. If screen is moved by \( 5 \times 10-2 \mathrm{~m} \) towards the slits, then change in fringe width is \( 3 \times 10^{-5} \mathrm{~m} \). If the distance between slits is \( 10-3 \) \( \mathrm{m} \) then wavelength of the light used will be
(a) \( 4000 \AA \)
(b) \( 6000 \AA \)
(c) \( 5890 \AA \)
(d) \( 8000 \AA \)
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