Question

In the Young's slits arrangement shown, a pattern of equally spaced, parallel fringes appears on a screen placed at S. Which quantity, if increased, would cause the separation of the fringes to increase?

• A. x
• B. y
• C. d
• D. l

Answer 1

Answer: (D)

l

Answer 2

Fringe separation =$\frac{\lambda\mathcal{l}}{d}$, so by increasing l