Physics

Problem

The two light beams having intensities

I

and

9I

produce a fringe pattern on a screen. The phase difference between the beams is

\frac{\pi}{2}

at point P and

\pi

at point Q. The difference between the resultant intensities at P and Q will be: (a)

2I

(b)

6I

(c)

5I

(d)

7I