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In a Young's double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is 8 1 th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to :

1. 0.94
2. 0.85
3. 0.74
4. 0.80

Correct answer: 0.85

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