In the case of light waves from two coherent sources `S_(1)` and `S_(2)`, there will be constructive interference at an arbitrary point P, the path difference `S_(1)P - S_(2)P` is

Options

A. `(n+(1)/(2))lambda`
B. `nlambda`
C. `(n-(1)/(2))lambda`
D. `(lambda)/(2)`

Answer

B

Explanation

Constructive interference occurs when the path difference `(S_(1)P-S_(2)P)` ia an integral multiple of `lambda` .
or `S_(1)P-S_(2)P=nlambda`
where `n=0,1,2,3,…`