Question

Select One Correct Option from the following: 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 $\frac{\pi }{2}$ at point A and $\pi$ at point B. Then the difference between resultant intensities at A and B is
(A) 2I
(B) 4I
(C) 5I
(D) 7I.

Answer 1

b option is correct I think

Answer 2

B 41 is correct mark me brainlist