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 π2 at point A and π at point B. Then, the difference between resultant intensities at A and B is
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 at point A and at point B. Then, the difference between resultant intensities at A and B is