Q. Following figure shows sources $S_{1}$ and $S_{2}$ that emits light of wavelength $\lambda$ in all directions. The sources are exactly in phase and are separated by a distance equal to $1.5\lambda$. If we start at the indicated start point and travel along path 1 and 2, the interference produce a maxima all along
A) Path 1
B) Path 2
C) Any path
D) None of these
Explanation
(a) At any point along the path 1, path difference between the waves is 0
Hence maxima is obtained all along the path 1
At any point along the path 2, path difference is $1.5\ \lambda$ which is odd multiple of $\frac{\lambda}{2}$, so minima is obtained all along the path 2
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.