Question

In Young�s double slit experiment, the fringe width is $\beta$. If the entire arrangement is placed in a liquid of refractive index $n$, the fringe width becomes :

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

Answer 1

Answer: (D)

$\frac{\beta}{n}$

Answer 2

The fringe width decreases when the arrangement is placed in a liquid of refractive index $n$, so the final fringe width becomes $\frac{B}{n}$.