The Principle of Mathematical Induction: Applications in Physical Optics

Figure 4

Rays from slits spaced units apart and convergent at a common point on a distant screen can be considered as approximately parallel in the vicinity of the slits when the screen to slit-barrier distance is much greater than the interslit distance. The angle is as indicated and the path difference between any pair of slits is given by the expression , where . It follows that the phase difference between adjacent slit pairs is (reproduced from [25] ©IOP Publishing Ltd. CCBY 4.0.).