{"id":87777,"date":"2025-06-01T06:53:59","date_gmt":"2025-06-01T06:53:59","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87777"},"modified":"2025-06-01T06:53:59","modified_gmt":"2025-06-01T06:53:59","slug":"if-a-ray-of-light-enters-from-a-rarer-medium-to-a-denser-medium-at-zer","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/if-a-ray-of-light-enters-from-a-rarer-medium-to-a-denser-medium-at-zer\/","title":{"rendered":"If a ray of light enters from a rarer medium to a denser medium at zer"},"content":{"rendered":"

If a ray of light enters from a rarer medium to a denser medium at zero angle of incidence, it would<\/p>\n

[amp_mcq option1=”reflect back.” option2=”go straight.” option3=”turn towards right.” option4=”bend at 45\u00b0.” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2021<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct answer is (B) go straight.
\n<\/section>\n
\nWhen a ray of light is incident normally (at zero angle of incidence) on the boundary between two different media, it passes from one medium to the other without changing its direction, regardless of whether it is moving from a rarer to a denser medium or vice versa. The angle of incidence is the angle between the incident ray and the normal to the surface. If this angle is zero, the angle of refraction (the angle between the refracted ray and the normal) will also be zero, as predicted by Snell’s Law (n1 sin\u03b81 = n2 sin\u03b82).
\n<\/section>\n
\nSnell’s Law states that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for a given pair of media. If \u03b81 = 0, then sin\u03b81 = 0. Thus, n2 sin\u03b82 = 0. Since n2 (refractive index of the second medium) is not zero, sin\u03b82 must be zero, which means \u03b82 = 0. Therefore, the refracted ray also lies along the normal, meaning it goes straight. Some partial reflection may occur at the boundary, but the transmitted light goes straight.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

If a ray of light enters from a rarer medium to a denser medium at zero angle of incidence, it would [amp_mcq option1=”reflect back.” option2=”go straight.” option3=”turn towards right.” option4=”bend at 45\u00b0.” correct=”option2″] This question was previously asked in UPSC NDA-1 – 2021 Download PDFAttempt Online The correct answer is (B) go straight. When a … <\/p>\n

Detailed SolutionIf a ray of light enters from a rarer medium to a denser medium at zer<\/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":[1093],"tags":[1110,1153,1128],"class_list":["post-87777","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1110","tag-optics","tag-physics","no-featured-image-padding"],"yoast_head":"\nIf a ray of light enters from a rarer medium to a denser medium at zer<\/title>\n<meta name=\"description\" content=\"The correct answer is (B) go straight. When a ray of light is incident normally (at zero angle of incidence) on the boundary between two different media, it passes from one medium to the other without changing its direction, regardless of whether it is moving from a rarer to a denser medium or vice versa. The angle of incidence is the angle between the incident ray and the normal to the surface. If this angle is zero, the angle of refraction (the angle between the refracted ray and the normal) will also be zero, as predicted by Snell's Law (n1 sin\u03b81 = n2 sin\u03b82).\" \/>\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\/if-a-ray-of-light-enters-from-a-rarer-medium-to-a-denser-medium-at-zer\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"If a ray of light enters from a rarer medium to a denser medium at zer\" \/>\n<meta property=\"og:description\" content=\"The correct answer is (B) go straight. When a ray of light is incident normally (at zero angle of incidence) on the boundary between two different media, it passes from one medium to the other without changing its direction, regardless of whether it is moving from a rarer to a denser medium or vice versa. The angle of incidence is the angle between the incident ray and the normal to the surface. If this angle is zero, the angle of refraction (the angle between the refracted ray and the normal) will also be zero, as predicted by Snell's Law (n1 sin\u03b81 = n2 sin\u03b82).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/if-a-ray-of-light-enters-from-a-rarer-medium-to-a-denser-medium-at-zer\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:53:59+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":"If a ray of light enters from a rarer medium to a denser medium at zer","description":"The correct answer is (B) go straight. When a ray of light is incident normally (at zero angle of incidence) on the boundary between two different media, it passes from one medium to the other without changing its direction, regardless of whether it is moving from a rarer to a denser medium or vice versa. The angle of incidence is the angle between the incident ray and the normal to the surface. If this angle is zero, the angle of refraction (the angle between the refracted ray and the normal) will also be zero, as predicted by Snell's Law (n1 sin\u03b81 = n2 sin\u03b82).","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\/if-a-ray-of-light-enters-from-a-rarer-medium-to-a-denser-medium-at-zer\/","og_locale":"en_US","og_type":"article","og_title":"If a ray of light enters from a rarer medium to a denser medium at zer","og_description":"The correct answer is (B) go straight. When a ray of light is incident normally (at zero angle of incidence) on the boundary between two different media, it passes from one medium to the other without changing its direction, regardless of whether it is moving from a rarer to a denser medium or vice versa. The angle of incidence is the angle between the incident ray and the normal to the surface. If this angle is zero, the angle of refraction (the angle between the refracted ray and the normal) will also be zero, as predicted by Snell's Law (n1 sin\u03b81 = n2 sin\u03b82).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/if-a-ray-of-light-enters-from-a-rarer-medium-to-a-denser-medium-at-zer\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T06:53:59+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\/if-a-ray-of-light-enters-from-a-rarer-medium-to-a-denser-medium-at-zer\/","url":"https:\/\/exam.pscnotes.com\/mcq\/if-a-ray-of-light-enters-from-a-rarer-medium-to-a-denser-medium-at-zer\/","name":"If a ray of light enters from a rarer medium to a denser medium at zer","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T06:53:59+00:00","dateModified":"2025-06-01T06:53:59+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The correct answer is (B) go straight. When a ray of light is incident normally (at zero angle of incidence) on the boundary between two different media, it passes from one medium to the other without changing its direction, regardless of whether it is moving from a rarer to a denser medium or vice versa. The angle of incidence is the angle between the incident ray and the normal to the surface. 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