{"id":90205,"date":"2025-06-01T10:22:52","date_gmt":"2025-06-01T10:22:52","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=90205"},"modified":"2025-06-01T10:22:52","modified_gmt":"2025-06-01T10:22:52","slug":"the-optical-phenomenon-that-is-responsible-for-the-propagation-of-ligh","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-optical-phenomenon-that-is-responsible-for-the-propagation-of-ligh\/","title":{"rendered":"The optical phenomenon that is responsible for the propagation of ligh"},"content":{"rendered":"

The optical phenomenon that is responsible for the propagation of light signal through an optical fibre is<\/p>\n

[amp_mcq option1=”interference” option2=”scattering” option3=”total internal reflection” option4=”refraction” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CAPF – 2018<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe correct answer is C) total internal reflection.
\n<\/section>\n
\nOptical fibres work by guiding light along a core made of a material with a higher refractive index, surrounded by a cladding material with a lower refractive index. Light rays entering the core at appropriate angles strike the interface between the core and the cladding at an angle greater than the critical angle. When this condition is met, the light is completely reflected back into the core, a phenomenon called total internal reflection (TIR). This process repeats along the length of the fibre, allowing the light signal to propagate with minimal loss.
\n<\/section>\n
\nRefraction is the bending of light as it passes from one medium to another with a different refractive index, which is involved when light *enters* the fibre but not for its propagation *within* the fibre. Interference and scattering are optical phenomena but are not the primary principle responsible for guiding light in optical fibres; scattering, in fact, is a cause of signal loss.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The optical phenomenon that is responsible for the propagation of light signal through an optical fibre is [amp_mcq option1=”interference” option2=”scattering” option3=”total internal reflection” option4=”refraction” correct=”option3″] This question was previously asked in UPSC CAPF – 2018 Download PDFAttempt Online The correct answer is C) total internal reflection. Optical fibres work by guiding light along a core … <\/p>\n

Detailed SolutionThe optical phenomenon that is responsible for the propagation of ligh<\/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":[1085],"tags":[1114,1153,1128],"class_list":["post-90205","post","type-post","status-publish","format-standard","hentry","category-upsc-capf","tag-1114","tag-optics","tag-physics","no-featured-image-padding"],"yoast_head":"\nThe optical phenomenon that is responsible for the propagation of ligh<\/title>\n<meta name=\"description\" content=\"The correct answer is C) total internal reflection. Optical fibres work by guiding light along a core made of a material with a higher refractive index, surrounded by a cladding material with a lower refractive index. Light rays entering the core at appropriate angles strike the interface between the core and the cladding at an angle greater than the critical angle. When this condition is met, the light is completely reflected back into the core, a phenomenon called total internal reflection (TIR). This process repeats along the length of the fibre, allowing the light signal to propagate with minimal loss.\" \/>\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\/the-optical-phenomenon-that-is-responsible-for-the-propagation-of-ligh\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The optical phenomenon that is responsible for the propagation of ligh\" \/>\n<meta property=\"og:description\" content=\"The correct answer is C) total internal reflection. Optical fibres work by guiding light along a core made of a material with a higher refractive index, surrounded by a cladding material with a lower refractive index. Light rays entering the core at appropriate angles strike the interface between the core and the cladding at an angle greater than the critical angle. When this condition is met, the light is completely reflected back into the core, a phenomenon called total internal reflection (TIR). This process repeats along the length of the fibre, allowing the light signal to propagate with minimal loss.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-optical-phenomenon-that-is-responsible-for-the-propagation-of-ligh\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T10:22:52+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":"The optical phenomenon that is responsible for the propagation of ligh","description":"The correct answer is C) total internal reflection. Optical fibres work by guiding light along a core made of a material with a higher refractive index, surrounded by a cladding material with a lower refractive index. Light rays entering the core at appropriate angles strike the interface between the core and the cladding at an angle greater than the critical angle. When this condition is met, the light is completely reflected back into the core, a phenomenon called total internal reflection (TIR). This process repeats along the length of the fibre, allowing the light signal to propagate with minimal loss.","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\/the-optical-phenomenon-that-is-responsible-for-the-propagation-of-ligh\/","og_locale":"en_US","og_type":"article","og_title":"The optical phenomenon that is responsible for the propagation of ligh","og_description":"The correct answer is C) total internal reflection. Optical fibres work by guiding light along a core made of a material with a higher refractive index, surrounded by a cladding material with a lower refractive index. Light rays entering the core at appropriate angles strike the interface between the core and the cladding at an angle greater than the critical angle. 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Optical fibres work by guiding light along a core made of a material with a higher refractive index, surrounded by a cladding material with a lower refractive index. Light rays entering the core at appropriate angles strike the interface between the core and the cladding at an angle greater than the critical angle. When this condition is met, the light is completely reflected back into the core, a phenomenon called total internal reflection (TIR). 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