Find the fringe width for the given arrangement \( \mathrm{P} \) wh...

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Find the fringe width for the given arrangement
\( \mathrm{P} \)
when source of wavelength \( 6000 \AA \) is replaced by a
W
source of wavelength \( 5000 \AA \), if fringe width in \( 1^{\text {st }} \) case is \( 1.2 \mathrm{~mm} \).
(1) \( 2 \mathrm{~mm} \)
(2) \( 2.1 \mathrm{~mm} \)
(3) \( 1 \mathrm{~mm} \)
(4) \( 1.5 \mathrm{~mm} \)
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