A double-slit pattern is observed on a screen 3m from the slits. Given that the light is incident normally and has a wavelength of 390nm, what is the minimum slit seperation for a point 3.8mm from the centre of the middle bright fringe to be
A) A maximum
b) a minimum

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I feel like I'm missing data. I can't use \[dsin \theta= x _{1}-x2\]

the question doesn't even specify if they are in phase or out of phase :/

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