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