Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase difference between t

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 π/2 at point A and π at point B . Then the difference between the resultant intensities at A and B is

(a) 2I

(b) 4I

(d) 7I

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

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