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## Main Question or Discussion Point

i just wanted to get this cleared that a beam falling on a diffraction grating with a shape gives the fourier images of the grating object which can be reobtained by placing a biconvex lens that would converge the rays and form a focussed fourier image at its focal length and the image of the object at other points.

please correct me if i have misunderstood any phenomenon above

and is there any relation between the grating lines and the fourier image? how can i calculate the transfer function of the lens?

please correct me if i have misunderstood any phenomenon above

and is there any relation between the grating lines and the fourier image? how can i calculate the transfer function of the lens?