- #1
Resero
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I have to find the first minima for a single slit diffraction problem. I know the wave length and the slit size, there is an unknow angle between the incidence wave and the perpendicular line to the slit plane.
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, which 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?
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, which 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?