Doubt: But in many books it is (2n-1)D/2d for minima... And for numericals what to use ? (2n-1) or (2n+1) Chapter: Wave Optics - Subject: Physics - Course: NEET Physics Course

But in many books it is (2n-1)D/2d for minima... And for numericals what to use ? (2n-1) or (2n+1)

Hello Ritesh

No matter. If it is (2n-1)D/2d, then we will put n=1 for first minima. If it is (2n+1)D/2d, then we will put n=0 for first minima