Question

In Youngs double slit experiment, the fringe width is $\beta$. If the entire arrangement is now placed inside a liquid of refractive index $\mu ,$ the fringe width will become

• A. $\mu \beta$
• B. $\beta /\mu$
• C. $\frac{\beta }{\mu +1}$
• D. $\frac{\beta }{\mu -1}$

Answer 1

The correct option is B $\beta /\mu$

$\lambda m=\frac{\lambda }{\mu }$

$\beta \propto \lambda$

${\beta }^{\prime }\propto \lambda \mu$

$\beta \text{'}=\frac{\beta }{\mu }$