{"id":506,"date":"2011-04-08T08:57:40","date_gmt":"2011-04-08T12:57:40","guid":{"rendered":"http:\/\/aplusphysics.com\/wordpress\/regents\/waves\/reflection-and-review\/"},"modified":"2011-04-08T08:57:40","modified_gmt":"2011-04-08T12:57:40","slug":"reflection-and-review","status":"publish","type":"post","link":"https:\/\/aplusphysics.com\/wordpress\/regents\/waves\/reflection-and-review\/","title":{"rendered":"Reflection and Review"},"content":{"rendered":"<p><a href=\"http:\/\/aplusphysics.com\/wordpress\/regents\/wp-content\/uploads\/2011\/04\/image3.png\"><img loading=\"lazy\" decoding=\"async\" style=\"border-bottom: 0px; border-left: 0px; display: inline; border-top: 0px; border-right: 0px\" title=\"image\" border=\"0\" alt=\"image\" src=\"http:\/\/aplusphysics.com\/wordpress\/regents\/wp-content\/uploads\/2011\/04\/image_thumb3.png\" width=\"594\" height=\"746\" \/><\/a> <\/p>\n<p>When a wave hits a boundary, three different events can occur. The wave may be:<\/p>\n<ul>\n<li>Reflected &#8211; wave bounces off a boundary <\/li>\n<li>Transmitted &#8211; wave is transmitted into the new medium <\/li>\n<li>Absorbed &#8211; energy of the wave is transferred into the boundary medium <\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: inline; margin-left: 0px; margin-right: 0px\" alt=\"Law of Reflection\" align=\"right\" src=\"http:\/\/www.aplusphysics.com\/courses\/regents\/waves\/images\/law-of-reflection.gif\" width=\"267\" height=\"200\" \/><\/p>\n<p>The <strong>law of reflection<\/strong> states that the angle at which a wave strikes a reflective medium (the angle of incidence, or <img loading=\"lazy\" decoding=\"async\" alt=\"theta_i\" align=\"absMiddle\" src=\"http:\/\/www.aplusphysics.com\/courses\/regents\/waves\/images\/theta_i.gif\" width=\"16\" height=\"24\" \/>) is equal to the angle at which a wave reflects off the medium (the angle of reflection, or <img loading=\"lazy\" decoding=\"async\" alt=\"theta_r\" align=\"absMiddle\" src=\"http:\/\/www.aplusphysics.com\/courses\/regents\/waves\/images\/theta_r.gif\" width=\"17\" height=\"24\" \/>). Put more simply, <img loading=\"lazy\" decoding=\"async\" alt=\"law of reflection\" align=\"absMiddle\" src=\"http:\/\/www.aplusphysics.com\/courses\/regents\/waves\/images\/law_of_reflection.gif\" width=\"45\" height=\"24\" \/>. In all cases, the angle of incidence and the angle of reflection are measured from a line perpendicular, or normal, to the reflecting surface.<\/p>\n<p>Although all waves can exhibit these behaviors, electromagnetic light waves are typically considered for demonstration purposes. When a wave bounces off a reflective surface, the nature of its reflection depends largely on the nature of the surface. Rough surfaces tend to reflect light in a variety of directions in a process known as <strong>diffuse reflection<\/strong>. Diffuse reflection is the type of reflection typically observed off of pieces of paper. Smooth surfaces tend to reflect light waves in a more regular fashion, such that the reflected rays maintain parallel reflected rays. This process is known as <strong>specular reflection<\/strong>, and is commonly observed in mirrors.<\/p>\n<blockquote>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"display: inline; margin-left: 0px; margin-right: 0px\" alt=\"Reflection Question Diagram\" align=\"right\" src=\"http:\/\/www.aplusphysics.com\/courses\/regents\/waves\/images\/Reflection_Q_Diagram.png\" width=\"157\" height=\"115\" \/><\/p>\n<p><strong>Question: <\/strong>The diagram represents a light ray reflecting from a plane mirror. Find the angle of reflection for the light ray.<\/p>\n<p><strong>Answer: <\/strong>The angle of reflection must be 25\u00b0, since the angle of incidence is 25\u00b0 (note that angles are always measured from the normal!)<\/p>\n<\/blockquote>\n<p><strong><\/strong><\/p>\n<p><strong>Review Problems<\/strong><\/p>\n<p>&#160;<a href=\"http:\/\/aplusphysics.com\/wordpress\/regents\/wp-content\/uploads\/2011\/04\/image4.png\"><img loading=\"lazy\" decoding=\"async\" style=\"border-bottom: 0px; border-left: 0px; display: inline; border-top: 0px; border-right: 0px\" title=\"image\" border=\"0\" alt=\"image\" src=\"http:\/\/aplusphysics.com\/wordpress\/regents\/wp-content\/uploads\/2011\/04\/image_thumb4.png\" width=\"588\" height=\"616\" \/><\/a><\/p>\n<p><a href=\"http:\/\/aplusphysics.com\/wordpress\/regents\/wp-content\/uploads\/2011\/04\/image5.png\"><img loading=\"lazy\" decoding=\"async\" style=\"border-bottom: 0px; border-left: 0px; display: inline; border-top: 0px; border-right: 0px\" title=\"image\" border=\"0\" alt=\"image\" src=\"http:\/\/aplusphysics.com\/wordpress\/regents\/wp-content\/uploads\/2011\/04\/image_thumb5.png\" width=\"592\" height=\"605\" \/><\/a> <\/p>\n<p><strong><\/strong><\/p>\n<p><strong>Key Points:<\/strong><\/p>\n<p>The velocity of a wave depends upon its medium.<\/p>\n<p>The frequency of a wave determines its nature and remains constant from medium to medium.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When a wave hits a boundary, three different events can occur. The wave may be: Reflected &#8211; wave bounces off a boundary Transmitted &#8211; wave is transmitted into the new medium Absorbed &#8211; energy of the wave is transferred into <a class=\"more-link\" href=\"https:\/\/aplusphysics.com\/wordpress\/regents\/waves\/reflection-and-review\/\">Continue reading <span class=\"screen-reader-text\">  Reflection and Review<\/span><span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[181,203,202,205,204,201,190,189,180],"class_list":["post-506","post","type-post","status-publish","format-standard","hentry","category-waves","tag-frequency","tag-incident-angle","tag-law-of-reflection","tag-medium","tag-reflected-angle","tag-reflection","tag-velocity","tag-wave-equation","tag-waves-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Reflection and Review - Regents Physics<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/aplusphysics.com\/wordpress\/regents\/waves\/reflection-and-review\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reflection and Review - Regents Physics\" \/>\n<meta property=\"og:description\" content=\"When a wave hits a boundary, three different events can occur. 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