How to fit the Fourier optical formula using matlab

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Homework Statement
For this formula, I don't know how to fit this formula to obtain the light intensity distribution. What I try to fit is a straight line parallel to the x-axis。
This one is about light passing through the surface of the liquid and forming a light field at the bottom of the water
Relevant Equations
y = k0 * (n - 1) * A * cos(w - k * x)
E = E0 * exp(1i * y1)
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