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A comment on An Intuitive Explanation of Fourier Theory. Parent comment

Re:An Intuitive Explanation of Fourier Theory by npk on Wednesday September 19, 2007 @03:24PM (#57012)
f is the focal length.
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Re:An Intuitive Explanation of Fourier Theory by iamwil on Saturday September 22, 2007 @12:11AM (#58250)
now I'm smacking myself. Yeah, should be obvious.
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