Intensity of central bright fringe due to interference of two identical coherent monochromatic sources is I. If one of the source is switched off, then intensity of central bright fringe becomes :

The intensity of the central fringe obtained in the interference pattern due to two identical slit sources is I. When one of the slits is closed then the intensity at the same point is I_0 . Then the correct relation between I and I_0 is :

In a YDSE, the central bright fringe can be identified.

The intensity of the central fringe due to the interference of light from two similar slits is I . When one of the slit is closed, the intensity is I_0 . The relation between I and I_0 is

Interference produced due to two identical coherent monochromatic sources results in central bright fringe with intensity I. If one of the source is removed intensity becomes I’. The relation between I and I’ is

Interference pattern is obtained on a screen due to two identical sources of monochromatics light. The intensity of the central brigh fringe is I when one of the two sources is blocked, its intensity becomes I_(0) . The intensity in two situations are related as

Both in interference and diffraction phenomena, alternate dark and bright fringes are obtained on screen i) generally fringe width is same in interference and not same in diffraction ii) the central fringe in interference has maximum brightness and thei intensity gradually decreases on either side iii) in interference the intensity of all bright fringes in same iv) both the phenomena are produced from same coherent sources