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In Young's double slit experiment, the slit separation is made threefold by keeping remaining setup same, the fringe width becomes
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$\frac{1}{3}$ times
Fringe width $\beta$, in terms of slit separation $d$ and screen distance $D$ is given by,
$\beta=\frac{\lambda D}{d}$
If $d$ is made three times, fringe width becomes $\frac{1}{3}$ times
$\beta=\frac{\lambda D}{d}$
If $d$ is made three times, fringe width becomes $\frac{1}{3}$ times
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