The path difference between two interfering light waves meeting at point on the screen is…
The path difference between two interfering light waves meeting at point on the screen is $\left(\frac{87}{2}\right) \lambda$. The band obtained at that point is
87th bright band
44th dark band
87th dark band
44 th bright band
Solution
Path difference $=87\left(\frac{\lambda}{2}\right)$.
$\therefore$ we get a dark point and $(2 n-1) \frac{\lambda}{2}=87\left(\frac{\lambda}{2}\right)$
$\therefore 2 n=88$
$\therefore \mathrm{n}=44$
$\therefore$ we get $44^{\text {th }}$ dark band.