{"id":85702,"date":"2025-06-01T03:25:07","date_gmt":"2025-06-01T03:25:07","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85702"},"modified":"2025-06-01T03:25:07","modified_gmt":"2025-06-01T03:25:07","slug":"a-ray-of-light-is-incident-on-a-plane-mirror-at-an-angle-of-40-with-r","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-is-incident-on-a-plane-mirror-at-an-angle-of-40-with-r\/","title":{"rendered":"A ray of light is incident on a plane mirror at an angle of 40\u00b0 with r"},"content":{"rendered":"

A ray of light is incident on a plane mirror at an angle of 40\u00b0 with respect to normal. When it gets reflected from the mirror, it undergoes a deviation of<\/p>\n

[amp_mcq option1=”40\u00b0” option2=”100\u00b0” option3=”90\u00b0” option4=”80\u00b0” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-2 – 2017<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nWhen a ray of light is incident on a plane mirror at an angle of 40\u00b0 with respect to normal, it undergoes a deviation of 80\u00b0.
\n<\/section>\n
\nAccording to the law of reflection, the angle of incidence (i) is equal to the angle of reflection (r), and both are measured with respect to the normal to the mirror surface. Given i = 40\u00b0, then r = 40\u00b0. Deviation is the angle between the direction of the incident ray and the direction of the reflected ray. If the incident ray were not reflected, it would continue in a straight line. The reflection changes its direction.
\n<\/section>\n
\nThe angle between the incident ray and the normal is 40\u00b0. The angle between the reflected ray and the normal is 40\u00b0 on the opposite side of the normal. The total angle between the incident ray and the reflected ray is the sum of the angle between the incident ray and the normal and the angle between the normal and the reflected ray in the plane of reflection, which is 40\u00b0 + 40\u00b0 = 80\u00b0. This angle represents the deviation of the ray from its original path. Alternatively, the angle between the incident ray and the mirror surface is \u03b8 = 90\u00b0 – i = 90\u00b0 – 40\u00b0 = 50\u00b0. The angle of deviation (\u03b4) for reflection from a plane mirror is also given by \u03b4 = 180\u00b0 – 2\u03b8 = 180\u00b0 – 2(50\u00b0) = 180\u00b0 – 100\u00b0 = 80\u00b0.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

A ray of light is incident on a plane mirror at an angle of 40\u00b0 with respect to normal. When it gets reflected from the mirror, it undergoes a deviation of [amp_mcq option1=”40\u00b0” option2=”100\u00b0” option3=”90\u00b0” option4=”80\u00b0” correct=”option2″] This question was previously asked in UPSC CDS-2 – 2017 Download PDFAttempt Online When a ray of light … <\/p>\n

Detailed SolutionA ray of light is incident on a plane mirror at an angle of 40\u00b0 with r<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1088],"tags":[1101,1153,1128],"class_list":["post-85702","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-2","tag-1101","tag-optics","tag-physics","no-featured-image-padding"],"yoast_head":"\nA ray of light is incident on a plane mirror at an angle of 40\u00b0 with r<\/title>\n<meta name=\"description\" content=\"When a ray of light is incident on a plane mirror at an angle of 40\u00b0 with respect to normal, it undergoes a deviation of 80\u00b0. According to the law of reflection, the angle of incidence (i) is equal to the angle of reflection (r), and both are measured with respect to the normal to the mirror surface. Given i = 40\u00b0, then r = 40\u00b0. Deviation is the angle between the direction of the incident ray and the direction of the reflected ray. If the incident ray were not reflected, it would continue in a straight line. The reflection changes its direction.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-is-incident-on-a-plane-mirror-at-an-angle-of-40-with-r\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A ray of light is incident on a plane mirror at an angle of 40\u00b0 with r\" \/>\n<meta property=\"og:description\" content=\"When a ray of light is incident on a plane mirror at an angle of 40\u00b0 with respect to normal, it undergoes a deviation of 80\u00b0. According to the law of reflection, the angle of incidence (i) is equal to the angle of reflection (r), and both are measured with respect to the normal to the mirror surface. Given i = 40\u00b0, then r = 40\u00b0. Deviation is the angle between the direction of the incident ray and the direction of the reflected ray. If the incident ray were not reflected, it would continue in a straight line. The reflection changes its direction.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-is-incident-on-a-plane-mirror-at-an-angle-of-40-with-r\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:25:07+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"A ray of light is incident on a plane mirror at an angle of 40\u00b0 with r","description":"When a ray of light is incident on a plane mirror at an angle of 40\u00b0 with respect to normal, it undergoes a deviation of 80\u00b0. According to the law of reflection, the angle of incidence (i) is equal to the angle of reflection (r), and both are measured with respect to the normal to the mirror surface. Given i = 40\u00b0, then r = 40\u00b0. Deviation is the angle between the direction of the incident ray and the direction of the reflected ray. If the incident ray were not reflected, it would continue in a straight line. The reflection changes its direction.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-is-incident-on-a-plane-mirror-at-an-angle-of-40-with-r\/","og_locale":"en_US","og_type":"article","og_title":"A ray of light is incident on a plane mirror at an angle of 40\u00b0 with r","og_description":"When a ray of light is incident on a plane mirror at an angle of 40\u00b0 with respect to normal, it undergoes a deviation of 80\u00b0. According to the law of reflection, the angle of incidence (i) is equal to the angle of reflection (r), and both are measured with respect to the normal to the mirror surface. Given i = 40\u00b0, then r = 40\u00b0. Deviation is the angle between the direction of the incident ray and the direction of the reflected ray. If the incident ray were not reflected, it would continue in a straight line. The reflection changes its direction.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-is-incident-on-a-plane-mirror-at-an-angle-of-40-with-r\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:25:07+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-is-incident-on-a-plane-mirror-at-an-angle-of-40-with-r\/","url":"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-is-incident-on-a-plane-mirror-at-an-angle-of-40-with-r\/","name":"A ray of light is incident on a plane mirror at an angle of 40\u00b0 with r","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:25:07+00:00","dateModified":"2025-06-01T03:25:07+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"When a ray of light is incident on a plane mirror at an angle of 40\u00b0 with respect to normal, it undergoes a deviation of 80\u00b0. 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