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10. Wave optics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics10. Wave optics1 Mark
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)

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

$\beta^{\prime}=\frac{\lambda D}{3 d}=\frac{\beta}{3}$

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