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In Young's experiment, light of wavelength $4000 Å$ is used to produce bright fringes of width $0.6 \mathrm{~mm}$, at a distance of 2 meters. If the whole apparatus is dipped in a liquid of refractive index 1.5 , then fringe width will be
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$0.4 \mathrm{~mm}$
$\beta_{\text {medium }}=\frac{\beta_{\text {air }}}{\mu}=\frac{0.6}{1.5}=0.4 \mathrm{~mm}$
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