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

1. 0.568
2. 0.853
3. 0.672
4. 0.760

Correct answer: 0.853

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