Q. If the separation between slits in Young’s double slit experiment is reduced to $\frac{1}{3}rd$, the fringe width becomes $n$ times. The value of $n$ is
A) 3
B) $\frac{1}{3}$
C) 9
D) $\frac{1}{9}$
Explanation
(a) $\beta \propto \frac{\lambda}{d}$ as $d \rightarrow \frac{d}{3}$ so $\beta \rightarrow 3\beta\ \therefore n = 3$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.