Suppose that a sinusoidal input g(x,y)=cos[2*pi(x*fx+y*fy)] is applied to a linear system. Under what (sufficient) conditions is the output a real sinusoidal function of the same spatial frequency as the input? Express the amplitude and phase of that output in terms of an appropriate characteristic of the system(adsbygoogle = window.adsbygoogle || []).push({});

From Goodman Introduction to Fourier Optics 2nd ED

I have no idea of how to do it. Thanks a lot

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# [help] Fourier Optics problem

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