The condition for constructive interference of two coherent beams is that the path difference should be

The condition for constructive interference of two coherent beams is t

1.	The condition for constructive interference of two coherent beams is that the path difference should be
A.	Integral multiple of ?/2
B.	Integral multiple of ?
C.	Odd integral multiple of ?/2
D.	Even integral multiple of ?
Answer» C. Odd integral multiple of ?/2