Solve this: Q.19. In Young's double slit experiment, when two light waves form third minimum, they have (1) Phase difference of 3 π (2) Path difference of 3 λ (3) Phase difference of 5 π 2 (4) Path difference of 5 λ 2 Share with your friends Share 9 Sanjay Upadhyay answered this Dear student option (3) is correct. regards -20 View Full Answer