Two coherent monochromatic point sources `S_1` and `S_2` are placed in front of an infinite screen
Channel: Doubtnut
Date: 2020-04-05

Two coherent monochromatic point sources `S_1` and `S_2` are placed in front of an infinite screen as shown in figure. Wavelength of the light emitted by both the sources is zero. Initial phase difference between the sources is zero.      Initially `S_(1)S_(2)=2.5 lambda` and the number of bright circular rings on the screen in `n_(1)`. if the distance `S_(1)S_(2)` is increased and made `5.7 lambda`, the number of bright circular rings becomes `n_(2)`. the difference `n_(2)-n_(1)` is