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by sirpilade
882 days ago
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Yes the explanation is diffraction. As light passes through a lens, diffraction acts in similar way as a light through a small pinhole. Incidentally, pinholes and apertures are low pass filters. Some more info here Miles V. Klein, Thomas E. Furtak - Optics 2nd ed, Wiley Joseph W. Goodman - Introduction to Fourier optics, W.H. Freeman |
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