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10. Wave optics — Physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 SciencePhysics10. Wave optics1 Mark
MCQ
If the separation between slits in Young’s double slit experiment is reduced to $\frac{1}{3}rd,$ the fringe width becomes $n$ times. The value of $n$ is
  • ✓
    $3$
  • B
    $\frac{1}{3}$
  • C
    $9$
  • D
    $\frac{1}{9}$
✓

Answer

Correct option: A.
$3$
a
(a)$\beta \propto \frac{\lambda }{d}$ as $d \to \frac{d}{3}$ so $\beta \to 3\beta $ $\therefore \,\,\,n = 3$

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