Two points nonochromatic and coherent sources of light of wavelength `lambda` each are placed as shown in figure. The initial phase difference between the sources is zero O. `(d gt gt d)`. Mark the correct statement(s).

Two coherent sources of light interfere and produce fringe pattern on a screen . For central maximum phase difference between two waves will be

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

The path difference between two wavefronts emitted by coherent sources of wavelength 5460 Å is 2.1 micron . The phase difference between the wavefronts at that point is –

What is the relation between phase difference and path difference ? The path difference at a point on the screen from two coherent sources is 5lambda//2 . Describe the possiblities of constructive and destructive interference at that point if the phase difference between the sources is either (i) pi or (ii) 2 pi .