Question

In Young’s double slit experiment, if the set up brought into the water from air, then fringe width:

• A. Becomes infinite
• B. Decreases
• C. Increases
• D. Remains unchanged

Answer 1

The correct option is B Decreases

Fringe width $\beta =\frac{\lambda D}{d}$
${\lambda }_w=\frac{\lambda }{{\mu }_w}{\beta }_w=\frac{\beta }{\mu }$
Fringe width decreases