In a two slit experiment with monochromatic light, fringes are obtained on a screen placed at so...

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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 the screen is moved by \( 5 \times 10^{-2} \mathrm{~m} \), towards the slits, the change in fringe width is \( 3 \times 10^{-5} \mathrm{~m} \). If separation between the slits is \( 10^{-3} \mathrm{~m} \), the wavelength of light used is
(a) \( 6000 \AA \)
(b) \( 5000 \AA \)
(c) \( 3000 \AA \)
(d) \( 4500 \AA \)
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