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An interference is observed due to two c...

An interference is observed due to two coherent sources `S_(1)` placed at origin and `S_(2)` placed at (0, 3l, 0). Here, `lambda` is the wavelength of the sources. Both sources are having equal intensity `I_(0)`. A detector D is moved along the positive x-axix.

Total number of black points observed by the observer on positive x-axis is

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