question_answer

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:                                  [JEE MAIN 2013]

A) points

B) straight lines

C) semi−circles

D) concentric circles

Correct Answer: D

Solution :

[d]

So, on a circle, path difference will be same locus of points having same path difference will be a circle, so fringes will make concentric circles.