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<p>blocking element like the slit/aperture. If there are multiple, <a href="page.php?w=diffraction_grating">closely spaced openings</a> (e.g., a <a href="page.php?w=diffraction_grating">diffraction grating</a>), a complex pattern of varying intensity can result.</p>

<p><big>Simple wavefronts and propagation</big></p>
<p>Optical systems can be described with <a href="page.php?w=Maxwell%27s_equations">Maxwell's equations</a>, and linear propagating waves such as sound or electron beams have similar wave equations. However, given the above simplifications,</p><p>
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