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**minimum**

**Necessary Formulaes**

for minima the waves should interfere destructively so the path difference [tex]\Delta x=\frac{n\lambda}{2}[/tex]

**ATTEMPT**

i am not so sure of this but we can have a plane [tex]\pi,\pi^{'}[/tex] with inclination [tex]\theta[/tex] to the plane of slits and through the slits.the [tex]\perp[/tex] distance of the Point P from the plane determines it's phase so the phase difference is difference between the length of perpendiculars from P to the planes [tex]=d \sin \theta=\frac{\lambda}{2}[/tex] which produces destructive interference.

**Doubt**

My doubt lies on the fact that how do we apply difference in optical lengths concept here