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Q. When the complete Young's double slit experiment is immersed in water, the fringes

J & K CETJ & K CET 2017Wave Optics

Solution:

When Young’s double slit experiment is repeated in water, instead of air.
$\lambda'=\frac{\lambda}{u}$, i.e.,
wavelength decreases . $\beta=\frac{\lambda' D}{d}$, i.e., fringe width decreases
$\therefore $ The fringes become narrower