{"id":93127,"date":"2025-06-01T11:42:24","date_gmt":"2025-06-01T11:42:24","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=93127"},"modified":"2025-06-01T11:42:24","modified_gmt":"2025-06-01T11:42:24","slug":"dioptre-is-the-si-unit-of","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/dioptre-is-the-si-unit-of\/","title":{"rendered":"Dioptre is the SI unit of :"},"content":{"rendered":"

Dioptre is the SI unit of :<\/p>\n

[amp_mcq option1=”size of the lens.” option2=”curvature of the lens.” option3=”power of the lens.” option4=”magnification produced by a lens.” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC CISF-AC-EXE – 2022<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nDioptre (symbol D) is the unit of measurement for the optical power of a lens or curved mirror.
\nOptical power (P) of a lens is defined as the reciprocal of its focal length (f) when the focal length is measured in metres.
\nP = 1 \/ f (where f is in metres)
\nIf the focal length f is in metres, the unit of power P is m\u207b\u00b9, which is defined as the dioptre (D).
\nFor example, a lens with a focal length of +0.5 metres has a power of P = 1 \/ 0.5 m = +2 D.
\nA lens with a focal length of -0.25 metres has a power of P = 1 \/ -0.25 m = -4 D.
\n<\/section>\n
\n– Dioptre is the unit used to measure the optical power of lenses.
\n– Optical power is the reciprocal of the focal length measured in metres.
\n<\/section>\n
\nSize of the lens is measured in units of length (e.g., diameter in cm). Curvature of the lens is related to the radii of curvature of its surfaces, usually measured in reciprocal metres (m\u207b\u00b9), and contributes to the power of the lens along with the refractive index of the material. Magnification is a ratio of image size to object size, which is a dimensionless quantity or expressed as ‘x’. Dioptre specifically quantifies the power of the lens to converge or diverge light.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Dioptre is the SI unit of : [amp_mcq option1=”size of the lens.” option2=”curvature of the lens.” option3=”power of the lens.” option4=”magnification produced by a lens.” correct=”option3″] This question was previously asked in UPSC CISF-AC-EXE – 2022 Download PDFAttempt Online Dioptre (symbol D) is the unit of measurement for the optical power of a lens or … <\/p>\n

Detailed SolutionDioptre is the SI unit of :<\/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":[1089],"tags":[1108,1140,1128],"class_list":["post-93127","post","type-post","status-publish","format-standard","hentry","category-upsc-cisf-ac-exe","tag-1108","tag-measurement-unit","tag-physics","no-featured-image-padding"],"yoast_head":"\nDioptre is the SI unit of :<\/title>\n<meta name=\"description\" content=\"Dioptre (symbol D) is the unit of measurement for the optical power of a lens or curved mirror. Optical power (P) of a lens is defined as the reciprocal of its focal length (f) when the focal length is measured in metres. P = 1 \/ f (where f is in metres) If the focal length f is in metres, the unit of power P is m\u207b\u00b9, which is defined as the dioptre (D). For example, a lens with a focal length of +0.5 metres has a power of P = 1 \/ 0.5 m = +2 D. A lens with a focal length of -0.25 metres has a power of P = 1 \/ -0.25 m = -4 D. - Dioptre is the unit used to measure the optical power of lenses. - Optical power is the reciprocal of the focal length measured in metres.\" \/>\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\/dioptre-is-the-si-unit-of\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dioptre is the SI unit of :\" \/>\n<meta property=\"og:description\" content=\"Dioptre (symbol D) is the unit of measurement for the optical power of a lens or curved mirror. Optical power (P) of a lens is defined as the reciprocal of its focal length (f) when the focal length is measured in metres. P = 1 \/ f (where f is in metres) If the focal length f is in metres, the unit of power P is m\u207b\u00b9, which is defined as the dioptre (D). For example, a lens with a focal length of +0.5 metres has a power of P = 1 \/ 0.5 m = +2 D. A lens with a focal length of -0.25 metres has a power of P = 1 \/ -0.25 m = -4 D. - Dioptre is the unit used to measure the optical power of lenses. - Optical power is the reciprocal of the focal length measured in metres.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/dioptre-is-the-si-unit-of\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T11:42:24+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":"Dioptre is the SI unit of :","description":"Dioptre (symbol D) is the unit of measurement for the optical power of a lens or curved mirror. Optical power (P) of a lens is defined as the reciprocal of its focal length (f) when the focal length is measured in metres. P = 1 \/ f (where f is in metres) If the focal length f is in metres, the unit of power P is m\u207b\u00b9, which is defined as the dioptre (D). For example, a lens with a focal length of +0.5 metres has a power of P = 1 \/ 0.5 m = +2 D. A lens with a focal length of -0.25 metres has a power of P = 1 \/ -0.25 m = -4 D. - Dioptre is the unit used to measure the optical power of lenses. - Optical power is the reciprocal of the focal length measured in metres.","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\/dioptre-is-the-si-unit-of\/","og_locale":"en_US","og_type":"article","og_title":"Dioptre is the SI unit of :","og_description":"Dioptre (symbol D) is the unit of measurement for the optical power of a lens or curved mirror. Optical power (P) of a lens is defined as the reciprocal of its focal length (f) when the focal length is measured in metres. P = 1 \/ f (where f is in metres) If the focal length f is in metres, the unit of power P is m\u207b\u00b9, which is defined as the dioptre (D). For example, a lens with a focal length of +0.5 metres has a power of P = 1 \/ 0.5 m = +2 D. A lens with a focal length of -0.25 metres has a power of P = 1 \/ -0.25 m = -4 D. - Dioptre is the unit used to measure the optical power of lenses. - Optical power is the reciprocal of the focal length measured in metres.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/dioptre-is-the-si-unit-of\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T11:42:24+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\/dioptre-is-the-si-unit-of\/","url":"https:\/\/exam.pscnotes.com\/mcq\/dioptre-is-the-si-unit-of\/","name":"Dioptre is the SI unit of :","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T11:42:24+00:00","dateModified":"2025-06-01T11:42:24+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Dioptre (symbol D) is the unit of measurement for the optical power of a lens or curved mirror. Optical power (P) of a lens is defined as the reciprocal of its focal length (f) when the focal length is measured in metres. P = 1 \/ f (where f is in metres) If the focal length f is in metres, the unit of power P is m\u207b\u00b9, which is defined as the dioptre (D). For example, a lens with a focal length of +0.5 metres has a power of P = 1 \/ 0.5 m = +2 D. A lens with a focal length of -0.25 metres has a power of P = 1 \/ -0.25 m = -4 D. - Dioptre is the unit used to measure the optical power of lenses. - Optical power is the reciprocal of the focal length measured in metres.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/dioptre-is-the-si-unit-of\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/dioptre-is-the-si-unit-of\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/dioptre-is-the-si-unit-of\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CISF-AC-EXE","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cisf-ac-exe\/"},{"@type":"ListItem","position":3,"name":"Dioptre is the SI unit of :"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/93127","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=93127"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/93127\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=93127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=93127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=93127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}