3-slit diffraction

For three parallel slits of equal size and with neighbor to neighbor distances being \(a\) and \(b\), respectively. The intensity at diffraction minima is zero, if \(\dfrac{a}{b} = \dfrac{n}{m}\), where \(n\) and \(m\) are positive integers when a plane wavefront of light perpendicular to slits illuminates them.

Which of the following is a possible value of \(n-m\)?

Assume that we ignore single slit diffraction.


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