{"id":346857,"date":"2024-01-27T14:14:32","date_gmt":"2024-01-27T14:14:32","guid":{"rendered":"\/forum\/forums\/reply\/346857\/"},"modified":"2024-01-27T14:18:52","modified_gmt":"2024-01-27T14:18:52","slug":"346857","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/346857\/","title":{"rendered":"Reply To: Diffraction theory"},"content":{"rendered":"<p>&lt;p&gt;Hi,&lt;\/p&gt;&lt;p&gt;Thank you for posting in the forum,&lt;\/p&gt;&lt;p&gt;I am giving clarification to the few terms used in the statement.&lt;\/p&gt;&lt;p&gt;<strong>Pupil with a hard edge: <\/strong>The &ldquo;pupil&rdquo; refers to the opening through which light passes in an optical system, like the iris in your eye or the aperture in a camera lens.&lt;\/p&gt;&lt;p&gt;&ldquo;Hard edge&rdquo; means that the pupil has a clear, abrupt transition from open to closed area. Unlike a blurry or gradual transition, a hard edge has a sharp distinction between where light can pass and where it cannot.&lt;\/p&gt;&lt;p&gt;When light passes through an aperture with a hard edge, it diffracts, meaning it bends and spreads out slightly beyond the geometric edges of the aperture. This diffraction creates a characteristic pattern of light and dark areas, called the diffraction pattern.&lt;\/p&gt;&lt;p&gt;The &ldquo;hard edge&rdquo; of the pupil cannot directly translate into a &ldquo;hard edge&rdquo; in its diffraction pattern. Because of the inherent wave nature of light, diffraction creates a smooth, gradual transition between light and dark regions in the pattern, even if the aperture itself has a sharp edge. This transition forms the &ldquo;ripples&rdquo; that extend towards infinity.&lt;\/p&gt;&lt;p&gt;Hope that Helps.&lt;br&gt;Akhil&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/27-01-2024-1706365073-dif.png\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-346857","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/346857","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/346857\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=346857"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}