I have to find the first minima for a single slit diffraction problem. I know the wave lenght and the slit size, there is an unknow angle between the incidence wave and the perpendicular line to the slit plane.(adsbygoogle = window.adsbygoogle || []).push({});

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?

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# Incidence angle in a Fraunhofer single slit problem

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