{"id":85341,"date":"2025-06-01T03:12:42","date_gmt":"2025-06-01T03:12:42","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=85341"},"modified":"2025-06-01T03:12:42","modified_gmt":"2025-06-01T03:12:42","slug":"the-power-of-a-lens-of-focal-length-10-cm-is","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-power-of-a-lens-of-focal-length-10-cm-is\/","title":{"rendered":"The power of a lens of focal length 10 cm is"},"content":{"rendered":"

The power of a lens of focal length 10 cm is<\/p>\n

[amp_mcq option1=”0\u22c51 dioptre” option2=”1 dioptre” option3=”10 dioptre” option4=”100 dioptre” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CDS-1 – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe power (P) of a lens is defined as the reciprocal of its focal length (f). The focal length must be expressed in meters for the power to be in dioptres (D).
\nGiven focal length f = 10 cm.
\nConvert focal length to meters: f = 10 cm \/ 100 cm\/m = 0.1 meters.
\nPower P = 1 \/ f (in meters) = 1 \/ 0.1 m = 10 dioptres.
\n<\/section>\n
\nPower of a lens (in dioptres) = 1 \/ Focal length (in meters).
\n<\/section>\n
\nA convex lens has a positive focal length and positive power, indicating that it converges light rays. A concave lens has a negative focal length and negative power, indicating that it diverges light rays. The unit dioptre is defined as m\u207b\u00b9.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

The power of a lens of focal length 10 cm is [amp_mcq option1=”0\u22c51 dioptre” option2=”1 dioptre” option3=”10 dioptre” option4=”100 dioptre” correct=”option3″] This question was previously asked in UPSC CDS-1 – 2023 Download PDFAttempt Online The power (P) of a lens is defined as the reciprocal of its focal length (f). The focal length must be … <\/p>\n

Detailed SolutionThe power of a lens of focal length 10 cm is<\/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":[1087],"tags":[1105,1153,1128],"class_list":["post-85341","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1105","tag-optics","tag-physics","no-featured-image-padding"],"yoast_head":"\nThe power of a lens of focal length 10 cm is<\/title>\n<meta name=\"description\" content=\"The power (P) of a lens is defined as the reciprocal of its focal length (f). The focal length must be expressed in meters for the power to be in dioptres (D). Given focal length f = 10 cm. Convert focal length to meters: f = 10 cm \/ 100 cm\/m = 0.1 meters. Power P = 1 \/ f (in meters) = 1 \/ 0.1 m = 10 dioptres. Power of a lens (in dioptres) = 1 \/ Focal length (in meters).\" \/>\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-power-of-a-lens-of-focal-length-10-cm-is\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The power of a lens of focal length 10 cm is\" \/>\n<meta property=\"og:description\" content=\"The power (P) of a lens is defined as the reciprocal of its focal length (f). The focal length must be expressed in meters for the power to be in dioptres (D). Given focal length f = 10 cm. Convert focal length to meters: f = 10 cm \/ 100 cm\/m = 0.1 meters. Power P = 1 \/ f (in meters) = 1 \/ 0.1 m = 10 dioptres. Power of a lens (in dioptres) = 1 \/ Focal length (in meters).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-power-of-a-lens-of-focal-length-10-cm-is\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T03:12:42+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 power of a lens of focal length 10 cm is","description":"The power (P) of a lens is defined as the reciprocal of its focal length (f). The focal length must be expressed in meters for the power to be in dioptres (D). Given focal length f = 10 cm. Convert focal length to meters: f = 10 cm \/ 100 cm\/m = 0.1 meters. Power P = 1 \/ f (in meters) = 1 \/ 0.1 m = 10 dioptres. Power of a lens (in dioptres) = 1 \/ Focal length (in meters).","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-power-of-a-lens-of-focal-length-10-cm-is\/","og_locale":"en_US","og_type":"article","og_title":"The power of a lens of focal length 10 cm is","og_description":"The power (P) of a lens is defined as the reciprocal of its focal length (f). The focal length must be expressed in meters for the power to be in dioptres (D). Given focal length f = 10 cm. Convert focal length to meters: f = 10 cm \/ 100 cm\/m = 0.1 meters. Power P = 1 \/ f (in meters) = 1 \/ 0.1 m = 10 dioptres. Power of a lens (in dioptres) = 1 \/ Focal length (in meters).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-power-of-a-lens-of-focal-length-10-cm-is\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T03:12:42+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\/the-power-of-a-lens-of-focal-length-10-cm-is\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-power-of-a-lens-of-focal-length-10-cm-is\/","name":"The power of a lens of focal length 10 cm is","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T03:12:42+00:00","dateModified":"2025-06-01T03:12:42+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"The power (P) of a lens is defined as the reciprocal of its focal length (f). The focal length must be expressed in meters for the power to be in dioptres (D). Given focal length f = 10 cm. Convert focal length to meters: f = 10 cm \/ 100 cm\/m = 0.1 meters. Power P = 1 \/ f (in meters) = 1 \/ 0.1 m = 10 dioptres. 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