{"id":88488,"date":"2025-06-01T07:12:11","date_gmt":"2025-06-01T07:12:11","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88488"},"modified":"2025-06-01T07:12:11","modified_gmt":"2025-06-01T07:12:11","slug":"if-the-focal-length-of-a-convex-lens-is-50-cm-which-one-of-the-follow","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/if-the-focal-length-of-a-convex-lens-is-50-cm-which-one-of-the-follow\/","title":{"rendered":"If the focal length of a convex lens is 50 cm, which one of the follow"},"content":{"rendered":"

If the focal length of a convex lens is 50 cm, which one of the following is its power?<\/p>\n

[amp_mcq option1=”+2 dioptre” option2=”+0\u202202 dioptre” option3=”-0\u20225 dioptre” option4=”+0\u20225 dioptre” correct=”option1″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2018<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nThe power of the convex lens with a focal length of 50 cm is +2 dioptre.
\n<\/section>\n
\n– The power of a lens (P) is the reciprocal of its focal length (f).
\n– The focal length must be expressed in meters when calculating power in dioptres.
\n– Given focal length f = 50 cm.
\n– Convert focal length to meters: 50 cm = 0.50 m.
\n– Power P = 1 \/ f (in meters).
\n– P = 1 \/ 0.50 m = 2 dioptres.
\n– A convex lens has a positive focal length and therefore a positive power.
\n<\/section>\n
\n– The unit of power of a lens is the dioptre (D), which is equal to m\u207b\u00b9.
\n– Convex lenses are converging lenses and are used to correct hypermetropia (far-sightedness).
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

If the focal length of a convex lens is 50 cm, which one of the following is its power? [amp_mcq option1=”+2 dioptre” option2=”+0\u202202 dioptre” option3=”-0\u20225 dioptre” option4=”+0\u20225 dioptre” correct=”option1″] This question was previously asked in UPSC NDA-2 – 2018 Download PDFAttempt Online The power of the convex lens with a focal length of 50 cm … <\/p>\n

Detailed SolutionIf the focal length of a convex lens is 50 cm, which one of the follow<\/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":[1094],"tags":[1114,1153,1128],"class_list":["post-88488","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1114","tag-optics","tag-physics","no-featured-image-padding"],"yoast_head":"\nIf the focal length of a convex lens is 50 cm, which one of the follow<\/title>\n<meta name=\"description\" content=\"The power of the convex lens with a focal length of 50 cm is +2 dioptre. - The power of a lens (P) is the reciprocal of its focal length (f). - The focal length must be expressed in meters when calculating power in dioptres. - Given focal length f = 50 cm. - Convert focal length to meters: 50 cm = 0.50 m. - Power P = 1 \/ f (in meters). - P = 1 \/ 0.50 m = 2 dioptres. - A convex lens has a positive focal length and therefore a positive power.\" \/>\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-the-focal-length-of-a-convex-lens-is-50-cm-which-one-of-the-follow\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"If the focal length of a convex lens is 50 cm, which one of the follow\" \/>\n<meta property=\"og:description\" content=\"The power of the convex lens with a focal length of 50 cm is +2 dioptre. - The power of a lens (P) is the reciprocal of its focal length (f). - The focal length must be expressed in meters when calculating power in dioptres. - Given focal length f = 50 cm. - Convert focal length to meters: 50 cm = 0.50 m. - Power P = 1 \/ f (in meters). - P = 1 \/ 0.50 m = 2 dioptres. - A convex lens has a positive focal length and therefore a positive power.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/if-the-focal-length-of-a-convex-lens-is-50-cm-which-one-of-the-follow\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T07:12:11+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 the focal length of a convex lens is 50 cm, which one of the follow","description":"The power of the convex lens with a focal length of 50 cm is +2 dioptre. - 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