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In the arrangement shown in the followin...

In the arrangement shown in the following figure, the wavelength of light used is `lambda`. The distance between slits `S_(1)` and `S_(2)` is d (« D). The distance between `S_(3)` and `S_(4)` is `u=lambda D // 3d`. If the ratio of maximum to minimum intensity observed on screen is k. Find k.

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