Q. In Young’s double slit experiment, the slit width and the distance of slits from the screen both are doubled. The fringe width
A) Increases
B) Decreases
C) Remains unchanged
D) None of these
Explanation
(c) Distance between two adjacent bright (or dark) fringes is called the fringe width. It is denoted by $\beta,$ thus
$\beta = \frac{D\lambda}{d}$
Where D is the distance between slit source and screen and d is separation of slits.
Since, D and d are increased to same extent, so fringe width $(w)$ will remain unchanged.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.