{"id":1238,"date":"2025-02-07T13:22:06","date_gmt":"2025-02-07T07:52:06","guid":{"rendered":"https:\/\/leverageedu.com\/questions-answers\/?p=1238"},"modified":"2025-05-05T11:05:24","modified_gmt":"2025-05-05T05:35:24","slug":"define-principal-focus-of-a-concave-mirror-and-focal-length-of-a-concave-mirror-draw-a-diagram-to-represent-the-action-of-a-concave-mirror-on-a-beam-of-parallel-light-rays","status":"publish","type":"post","link":"https:\/\/leverageedu.com\/questions-answers\/define-principal-focus-of-a-concave-mirror-and-focal-length-of-a-concave-mirror-draw-a-diagram-to-represent-the-action-of-a-concave-mirror-on-a-beam-of-parallel-light-rays\/","title":{"rendered":"Define (i) Principal Focus of a Concave Mirror, and (ii) Focal Length of a Concave Mirror. Draw a Diagram to Represent the Action of a Concave Mirror on a Beam of Parallel Light Rays."},"content":{"rendered":"\n<p class=\"has-medium-font-size\"><strong>Answer:&nbsp;<\/strong><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>(i) Principal Focus of a Concave Mirror<\/strong><\/p>\n\n\n\n<p>The principal focus (F) of a concave mirror is the point on its principal axis where light rays parallel to the principal axis converge after reflection. It is a real point located on the same side as the object.<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>(ii) Focal Length of a Concave Mirror<\/strong><\/p>\n\n\n\n<p>The focal length (f) of a concave mirror is the distance between the pole (P) and the principal focus (F). It determines how strongly the mirror converges or diverges light. The focal length is related to the radius of curvature (R) by the formula:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXcKmrOX-0Aw8oQO1riZR2jgeidEFPBKmDFPUK0wXl9jlvqOcvkHHJRTRrFNzuvlA7DZzVwkCrtf0zZ3pYI4S5wASd7KRt5ZHrY-OlBpVn7Q_9AFKDENIn2oxF50baaW0Kvk3_najw?key=p1d29KFj-tz8-EDkZnHkdr4q\" alt=\"\" \/><\/figure>\n\n\n\n<p>where R is the radius of curvature (the distance between the pole and the centre of curvature).<\/p>\n\n\n\n<p class=\"has-medium-font-size\"><strong>Diagram: Concave Mirror and Parallel Light Rays<\/strong><\/p>\n\n\n\n<p>Here is a diagram representing how a concave mirror focuses parallel light rays:<\/p>\n\n\n\n<p>{Imagine a concave mirror with parallel light rays converging at the focal point, and labelled components: Pole (P), Focus (F), Centre of Curvature (C), Principal Axis, and Focal Length (f).}<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/lh7-rt.googleusercontent.com\/docsz\/AD_4nXfKFpyxqo8fZcVZ-0a6DdDKBmsfRWbWfUJRwqoL_3Dyl9aCQ88gxJU-eZ1EI0X7oJYrWHtSCyLvwwKrEk9V6veEvxgL71S4jDYcnUh40Ci3vzeO2_YOHjxBumEMkuj7JozNNGR_?key=p1d29KFj-tz8-EDkZnHkdr4q\" alt=\"Diagram of Concave Mirror and Parallel Light Rays\n\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The concave mirror is also known as a converging mirror because it brings parallel light rays to a single point after reflection.<\/li>\n\n\n\n<li>The real and inverted images formed by a concave mirror have applications in telescopes, vehicle headlights, and shaving mirrors.<\/li>\n\n\n\n<li>The distance of the object from the mirror determines the type of image formed (real\/virtual, magnified\/diminished, inverted\/erect).<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-align-center has-vivid-red-color has-text-color has-link-color has-medium-font-size wp-elements-10036f8bd31f70cdf024598498ebbb78\"><strong>Common Doubts in Physics<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-fixed-layout\"><tbody><tr><td><a href=\"https:\/\/leverageedu.com\/questions-answers\/differentiate-between-regular-and-irregular-reflection\/\"><strong>Differentiate Between Regular and Irregular Reflection<\/strong><\/a><\/td><\/tr><tr><td><a href=\"https:\/\/leverageedu.com\/questions-answers\/state-four-points-of-difference-between-a-concave-mirror-and-a-convex-mirror\/\"><strong>Difference between a Concave Mirror and a Convex Mirror<\/strong><\/a><\/td><\/tr><tr><td><a href=\"https:\/\/leverageedu.com\/questions-answers\/is-electric-current-a-scalar-or-vector-quantity-state-the-standard-unit-of-electric-current\/\"><strong>Is Electric Current a Scalar or Vector Quantity?<\/strong><\/a><\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"Answer:&nbsp; (i) Principal Focus of a Concave Mirror The principal focus (F) of a concave mirror is the&hellip;\n","protected":false},"author":90,"featured_media":1242,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"editor_notices":[],"footnotes":""},"categories":[7,4],"tags":[],"class_list":{"0":"post-1238","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-physics","8":"category-science"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Define (i) Principal Focus of a Concave Mirror, and (ii) Focal Length of a Concave Mirror. Draw a Diagram to Represent the Action of a Concave Mirror on a Beam of Parallel Light Rays.<\/title>\n<meta name=\"description\" content=\"The principal focus of a concave mirror is point on principal axis where light rays parallel to the principal axis converge after reflection.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/leverageedu.com\/questions-answers\/define-principal-focus-of-a-concave-mirror-and-focal-length-of-a-concave-mirror-draw-a-diagram-to-represent-the-action-of-a-concave-mirror-on-a-beam-of-parallel-light-rays\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Define (i) Principal Focus of a Concave Mirror, and (ii) Focal Length of a Concave Mirror. Draw a Diagram to Represent the Action of a Concave Mirror on a Beam of Parallel Light Rays.\" \/>\n<meta property=\"og:description\" content=\"The principal focus of a concave mirror is point on principal axis where light rays parallel to the principal axis converge after reflection.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/leverageedu.com\/questions-answers\/define-principal-focus-of-a-concave-mirror-and-focal-length-of-a-concave-mirror-draw-a-diagram-to-represent-the-action-of-a-concave-mirror-on-a-beam-of-parallel-light-rays\/\" \/>\n<meta property=\"og:site_name\" content=\"Questions &amp; Answers\" \/>\n<meta property=\"article:published_time\" content=\"2025-02-07T07:52:06+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-05-05T05:35:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogassets.leverageedu.com\/media\/uploads\/sites\/5\/2025\/02\/07132047\/Define-Principal-Focus-of-a-Concave-Mirror-and-Focal-Length-of-a-Concave-Mirror.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1024\" \/>\n\t<meta property=\"og:image:height\" content=\"640\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Harshita\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Harshita\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Define (i) Principal Focus of a Concave Mirror, and (ii) Focal Length of a Concave Mirror. 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