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I konw that i have to use the Fraunhofer euqtion for a single slit, i already have the correct answer. But I must to explain why the incident angle does not affect the result.

The equation applies for a monochromatich wave, wich front is parallel to the slit, and the wave lenght<<slit size. right?

If the wave front is parallel to the plane is difference in the phase of the secundary sources, ok? ( I´m not sure of this)

If there is an angle this phase difference is another, but the Fraunhofer equation gives us the answer anyway?