MCQ
In Young's double slit interference experiment, the slit separation is made $3$ folds. The fringe width becomes ......... times
- ✓$\frac{1}{3}$
- B$\frac{1}{9}$
- C$3$
- D$9$
✓
Answer
Correct option: A.
$\frac{1}{3}$
a
(a)
(a)
Fringe width $\beta=\frac{\lambda D}{d}$
$\beta^{\prime}=\frac{\lambda D}{3 d}=\frac{\beta}{3}$
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