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== Theory: explanation of θ_max,r required ==
I think adding a ray diagram explaining terms like '''θ_max''' and '''r''' will be more helpful in understanding the process of partial interception of spherical wave field by lens. For example, '''r''' described as "..r is radial distance in the image plane.." does not clarify which radial distance has been mentioned here. <span style="font-size: smaller;" class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/59.185.236.53|59.185.236.53]] ([[User talk:59.185.236.53|talk]]) 11:25, 27 April 2013 (UTC)</span><!-- Template:Unsigned IP --> <!--Autosigned by SineBot-->
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