{"id":361116,"date":"2017-02-03T03:00:00","date_gmt":"2017-02-03T00:00:00","guid":{"rendered":"https:\/\/www.fyysika.ee\/?guid=2792b634ee57625869d3ff5e66dd00f6"},"modified":"2017-02-03T03:00:00","modified_gmt":"2017-02-03T00:00:00","slug":"understanding-the-power-reflection-and-transmission-coefficients-of-a-plane-wave-at-a-planarinterface-2","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=361116","title":{"rendered":"Understanding the power reflection and transmission coefficients of a plane wave at a planar\r\ninterface"},"content":{"rendered":"<p>In most textbooks, after discussing the partial transmission and reflection of a plane wave at a<br \/>\nplanar interface, the power (energy) reflection and transmission coefficients are introduced by<br \/>\ncalculating the normal-to-interface components of the Poynting vectors for the incident, reflected<br \/>\nand transmitted waves, separately. Ambiguity arises among students since, for the Poynting vector to<br \/>\nbe interpreted as the energy flux density, on the incident (reflected) side, the electric and<br \/>\nmagnetic fields involved must be the total fields, namely, the sum of incident and reflected fields,<br \/>\ninstead of the partial fields which are just the incident (reflected) fields. The interpretation of<br \/>\nthe cross product of partial fields as energy flux has not been obviously justified in most<br \/>\ntextbooks. Besides, the plane wave is actually an idealisation that is only ever found in textbooks,<br \/>\nthen what do the reflection and transmission coefficients evaluated for a plane wave really mean for<br \/>\na real beam&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In most textbooks, after discussing the partial transmission and reflection of a plane wave at a<br \/>\nplanar interface, the power (energy) reflection and transmission coefficients are introduced by<br \/>\ncalculating the normal-to-interface components of the Poy&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[178],"tags":[],"class_list":{"0":"post-361116","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-rss-fuusikaharidus","7":"entry"},"_links":{"self":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/361116","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=361116"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/361116\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=361116"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=361116"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=361116"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}