Question

In Young's double slit interference experiment, the slit separation is made 3 fold. The fringe width becomes.

• A. 1/3 times
• B. 1/9 times
• C. 3 times
• D. 9 times

Answer 1

Answer: (A)

1/3 times

Answer 2

$\beta \propto \frac{1}{d}$⇒ If d becomes thrice, then $\beta$ become becomes $\frac{1}{3}$ times.