Classification Of Interference Phenomenon

The central fringe (y=0) is always bright.

The fringes are equidistant and parallel to x axis. The fringe width is given by

               -----------------------------------------(5)

The intensity distribution on screen for these superimposing waves is given by

Assuming that the two light waves are of equal intensity I₀

          ------------------------------ (6)

Fig.B: Resultant intensity distribution as a function of phase difference for two intensity waves of same amplitude.