{"id":244494,"date":"2016-07-15T02:00:00","date_gmt":"2016-07-14T23:00:00","guid":{"rendered":"http:\/\/www.fyysika.ee\/?guid=6f6ae17c49a8dec4f1b94ab10235a50c"},"modified":"2016-07-15T02:00:00","modified_gmt":"2016-07-14T23:00:00","slug":"bringing-the-magic-of-light-to-remote-areas-where-resources-are-scarce-beautiful-demonstrations-ofinterference-patterns-using-laser-pens-and-fibres","status":"publish","type":"post","link":"https:\/\/www.fyysika.ee\/?p=244494","title":{"rendered":"Bringing the magic of light to remote areas where resources are scarce: beautiful demonstrations of\r\ninterference patterns using laser pens and fibres"},"content":{"rendered":"<p>The training of physics teachers in remote areas in the developing world requires dedicated trainers<br \/>\n(who typically are volunteers), as well as robust logistics. The latter must include the supply of<br \/>\nequipment for experiments in the classroom. This task is greatly aided by the use of cheap, safe and<br \/>\nreadily available consumer goods that do not require local power supplies. In this paper, a simple<br \/>\nexperiment using a laser pointer pen and samples of hair as well as wire and transparent thin fibre<br \/>\nis presented, reproducing a variant of Thomas Youngs\u2019 famed double slit experiment. The spread of<br \/>\nthe interference pattern as it projects itself on a screen is sufficiently large to catch the<br \/>\ninterest of students, and its orientation being perpendicular to that of the hair is also strikingly<br \/>\ncounter-intuitive. The students are then encouraged to apply the simplified Fraunhofer equation to<br \/>\nthe various samples to find out the width of their hair. Ideally, these samples would also include<br \/>\nca&#8230;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The training of physics teachers in remote areas in the developing world requires dedicated trainers<br \/>\n(who typically are volunteers), as well as robust logistics. The latter must include the supply of<br \/>\nequipment for experiments in the classroom. This t&#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-244494","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\/244494","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=244494"}],"version-history":[{"count":0,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=\/wp\/v2\/posts\/244494\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=244494"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=244494"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fyysika.ee\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=244494"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}