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The phase difference between light waves...

The phase difference between light waves from two slits of Young's experiment is `pi` radian. Will the central fringe be bright or dark ?

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Central fringe will be dark.
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Assertion (A) : If the phase difference between the light waves emerging from the slits of the Young's experment is pi - radian, the central fringe will be dark Reason (R ) : Phase differrence is equal to (2pi//lambda) times the path difference.

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