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  4. In young's double slit experiment, the fringe width is 12 mm. If the entire arrangement is placed in water of refractive index (4/3), then the fringe width becomes (in mm )

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Q. In young's double slit experiment, the fringe width is $12\, mm$. If the entire arrangement is placed in water of refractive index $\frac{4}{3}$, then the fringe width becomes (in $mm$ )

JEE MainJEE Main 2022Wave Optics

Solution:

For a given light wavelength corresponding a medium of refractive index
$= $_________
and we know that fringe width ____
Therefore, $\beta_{\text {med }}=$ _____ $=\frac{12}{\underline{4}}=9 \,mm$