Two beams of light having intensities and interfere to produce a fringe pattern on a…

PHYSICS · Single correct · A Level · Physics · Waves · Waves

Problem

Two beams of light having intensities

I

and

4I

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

\pi/2

at point A and

\pi

at point B. Then the difference between the resultant intensities at A and B is (1)

2I

(2)

4I

(3)

5I

(4)

7I