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Two beams of light having intensities I and 4 I interfere to produce a fringe pattern on a screen. The phase difference between the beams is 2  at point A and  at point B . Then the difference between the resultant intensities at A and B is

1. 2 I
2. 4 I
3. 5 I
4. 7 I

Correct answer: 4 I

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