Physics - Wave Optics Question with Solution | TestHub

Given,

Path difference$\left(\mathrm{\Delta }\right)=13.5\lambda$......(i)

We know that, for minima

Path difference$\left(\mathrm{\Delta }\right)=\left(n+\frac{1}{2}\right)\lambda$......(ii)

We can write Eq. (i) in the following form

$\mathrm{\Delta }=\left(13+\frac{1}{2}\right)\lambda$......(iii)

From Eq. (ii) and (iii), it is clear that there will be minima. So, the point will be dark.