Two monochromatic coherent point sources `S_(1)` and `S_(2)` are separated by a distance L. Each sources emits light of wavelength `lambda`, where `L gt gt lambda`. The line `S_(1) S_(2)` when extended meets a screen perpendicular to it at point A. Then
A. The interference fringe are circular is shape
B. Interference fringes are straight lines perpendiculars to line `S_(1)S_(2)A`
C. On the point A intensity is maximum if `L=nlambda` (n is an integer)
D. Point A is always an intensity maximum for any separation L
