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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Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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