In a young's double slit experiment, slits are illuminated \( \math...

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In a young's double slit experiment, slits are illuminated
\( \mathrm{P} \) by a monochromatic source of wavelength \( 6000 \AA \) and fringes

W are obtained. If screen is moved by a distance of \( 5 \mathrm{~cm} \) towards slits, change in fringe width is \( 3 \times 10^{-5} \mathrm{~m} \). Then separation between the slits will be :
(A) \( 1 \mathrm{~mm} \)
(B) \( 1.2 \mathrm{~mm} \)
(C) \( 1.5 \mathrm{~mm} \)
(D) \( 1.63 \mathrm{~mm} \)
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