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    The first dark fringe in the diffraction pattern of a single slit is located at an angle of theta(sub A) = 25°. With the same light, the first dark fringe formed with another single slit is at an angle of theta(sub B) = 60°. Find the ratio W(sub A)/W(sub B) of the widths of the two slits.

    Really don't know where to start on this one.

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    The first dark fringe in the diffraction pattern of a single slit is located at an angle of θA ...

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