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

Answer 1

The correct option is C concentric circles

for a given path difference many points can be found on the screen and locus of all these points are semicircles. hence, fringes will be in concentric circle forms.