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

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A fringe width of \( 6 \mathrm{~mm} \) was produced for two slits
P separated by \( 1 \mathrm{~mm} \) apart. The screen is placed \( 10 \mathrm{~m} \)
W. away. The wavelength of light used is \( x \) nm. The value of \( x \) ' to the nearest integer is JEE Main-2021 (March)]
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