- #1

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Other than having been told by my lecturers that the output of a lenses is the Fourier Transform of the input I have no idea why this happens?

I hope this question is clear. The whole concept is rather confusing to me.

- Thread starter X-Kirk
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- #1

- 4

- 0

Other than having been told by my lecturers that the output of a lenses is the Fourier Transform of the input I have no idea why this happens?

I hope this question is clear. The whole concept is rather confusing to me.

- #2

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What creates the Fourier transform is the coherent light interacting with the fine structure of the object illuminated. Do you need a lens to perform a Fourier transform? No one simply need to go into the far field to observe it (Fraunhofer distance). By using a lens, one can move the far-field into the focal plane of the lens.

Incidentally, even with a lens, without coherent light, the Fourier transform is not formed.

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