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At two points P and Q on a screen in Young ’ s double slit experiment, waves from slits S 1 and S 2 have a path difference of 0 and 4  respectively. The ratio of intensities at P and Q will be :

1. 2 : 1
2. 2 : 1
3. 4 : 1
4. 3: 2

Correct answer: 2 : 1

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