A fringe width of \( 6 \mathrm{~mm} \) was produced for two slits s...

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A fringe width of \( 6 \mathrm{~mm} \) was produced for two slits separated by \( 1 \mathrm{~mm} \) apart. The screen is placed \( 10 \mathrm{~m} \)
\( \mathrm{P} \) away. The wave length of light used is \( x \mathrm{~nm} \). The value of \( x \) ' to the nearest integer is
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