Two sources of same intensity interfere at a point and produced resultant I. When one source is removed, the intensity at that point will be
Light from two coherent sources of same amplitude (A) and wavelength (λ) illuminates the screen. The intensity of central maximum is I0. If the source were incoherent, the intensity at the same point will be"=:
The intensity of the waves from sources S1 and S2 are I0. They interfere at D and the wavelength of the wave is λ=4 m. Resultant intensity at D will be