Q. For the sustained interference of light, the necessary condition is that the two sources should
A) Have constant phase difference
B) Be narrow
C) Be close to each other
D) Of same amplitude
Explanation
(a) The essential condition for sustained interference is constancy of phase difference
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.