Question

Two coherent light sources, each of wavelength `lambda`, are separated by a distance `3 lambda`, The maximum number of minima formed on line AB, which funs from `-oo` to `+oo`, is

A. 2
B. 4
C. 6
D. 8

Answer 1

Correct Answer - c
There can be three minima from central point to `oo` corresponding to `(lambda)/(3) , (3 lambda)/(2) , (5 lambda)/(2)` path differences.
Therefore, total number of minima `= 2n_(max) = 6`.