{"id":86807,"date":"2025-06-01T04:21:08","date_gmt":"2025-06-01T04:21:08","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=86807"},"modified":"2025-06-01T04:21:08","modified_gmt":"2025-06-01T04:21:08","slug":"a-ray-of-light-strikes-a-glass-slab-from-air-which-one-of-the-follo","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-strikes-a-glass-slab-from-air-which-one-of-the-follo\/","title":{"rendered":"A ray of light strikes a glass slab (from air). Which one of the follo"},"content":{"rendered":"

A ray of light strikes a glass slab (from air). Which one of the following is NOT correct?<\/p>\n

[amp_mcq option1=”The speed of light in glass is less than that in air” option2=”The frequency of light in glass is same as that in air” option3=”The wavelength of light in glass is less than that in air” option4=”The frequency of light in glass is less than that in air” correct=”option4″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC Geoscientist – 2021<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nWhen light passes from one medium (air) to another medium (glass), its speed decreases, and its wavelength decreases. However, the frequency of the light wave is determined by the source and remains constant as it passes from one medium to another. Therefore, the statement “The frequency of light in glass is less than that in air” is incorrect.
\n<\/section>\n
\nThe speed of light (v), frequency (f), and wavelength (\u03bb) are related by the equation v = f\u03bb. When light enters a denser medium like glass from air, its speed (v) decreases, and since the frequency (f) remains constant, the wavelength (\u03bb) must decrease proportionally (\u03bb = v\/f).
\n<\/section>\n
\nThe change in speed and wavelength causes the bending of light, known as refraction. The refractive index of a medium is defined as the ratio of the speed of light in vacuum to the speed of light in the medium.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

A ray of light strikes a glass slab (from air). Which one of the following is NOT correct? [amp_mcq option1=”The speed of light in glass is less than that in air” option2=”The frequency of light in glass is same as that in air” option3=”The wavelength of light in glass is less than that in air” … <\/p>\n

Detailed SolutionA ray of light strikes a glass slab (from air). Which one of the follo<\/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":[1091],"tags":[1110,1153,1128],"class_list":["post-86807","post","type-post","status-publish","format-standard","hentry","category-upsc-geoscientist","tag-1110","tag-optics","tag-physics","no-featured-image-padding"],"yoast_head":"\nA ray of light strikes a glass slab (from air). Which one of the follo<\/title>\n<meta name=\"description\" content=\"When light passes from one medium (air) to another medium (glass), its speed decreases, and its wavelength decreases. However, the frequency of the light wave is determined by the source and remains constant as it passes from one medium to another. Therefore, the statement "The frequency of light in glass is less than that in air" is incorrect. The speed of light (v), frequency (f), and wavelength (\u03bb) are related by the equation v = f\u03bb. When light enters a denser medium like glass from air, its speed (v) decreases, and since the frequency (f) remains constant, the wavelength (\u03bb) must decrease proportionally (\u03bb = v\/f).\" \/>\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-strikes-a-glass-slab-from-air-which-one-of-the-follo\/\" \/>\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 strikes a glass slab (from air). Which one of the follo\" \/>\n<meta property=\"og:description\" content=\"When light passes from one medium (air) to another medium (glass), its speed decreases, and its wavelength decreases. However, the frequency of the light wave is determined by the source and remains constant as it passes from one medium to another. Therefore, the statement "The frequency of light in glass is less than that in air" is incorrect. The speed of light (v), frequency (f), and wavelength (\u03bb) are related by the equation v = f\u03bb. When light enters a denser medium like glass from air, its speed (v) decreases, and since the frequency (f) remains constant, the wavelength (\u03bb) must decrease proportionally (\u03bb = v\/f).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-strikes-a-glass-slab-from-air-which-one-of-the-follo\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T04:21:08+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 strikes a glass slab (from air). 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When light enters a denser medium like glass from air, its speed (v) decreases, and since the frequency (f) remains constant, the wavelength (\u03bb) must decrease proportionally (\u03bb = v\/f).","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-strikes-a-glass-slab-from-air-which-one-of-the-follo\/","og_locale":"en_US","og_type":"article","og_title":"A ray of light strikes a glass slab (from air). Which one of the follo","og_description":"When light passes from one medium (air) to another medium (glass), its speed decreases, and its wavelength decreases. However, the frequency of the light wave is determined by the source and remains constant as it passes from one medium to another. Therefore, the statement \"The frequency of light in glass is less than that in air\" is incorrect. The speed of light (v), frequency (f), and wavelength (\u03bb) are related by the equation v = f\u03bb. When light enters a denser medium like glass from air, its speed (v) decreases, and since the frequency (f) remains constant, the wavelength (\u03bb) must decrease proportionally (\u03bb = v\/f).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-strikes-a-glass-slab-from-air-which-one-of-the-follo\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T04:21:08+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-strikes-a-glass-slab-from-air-which-one-of-the-follo\/","url":"https:\/\/exam.pscnotes.com\/mcq\/a-ray-of-light-strikes-a-glass-slab-from-air-which-one-of-the-follo\/","name":"A ray of light strikes a glass slab (from air). 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