Question

Two coherent point sources $S_1$ and $S_2$ are separated by a small distance $d$ as shown. The fringes obtained on the screen will be

• A. points
• B. straight lines
• C. semi-circle
• D. concentric circles

Answer 1

Answer: (D)

concentric circles

Answer 2

A fringe is a locus of points having constant path difference
from the two coherent sources $S_1$ and $S_2$. It will be concentric
circle.