{"id":8236,"date":"2024-04-15T02:57:10","date_gmt":"2024-04-15T02:57:10","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=8236"},"modified":"2024-04-15T02:57:10","modified_gmt":"2024-04-15T02:57:10","slug":"the-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/the-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/","title":{"rendered":"The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as A. Isocenter B. Principal point C. Perspective centre D. Plumb line"},"content":{"rendered":"<p>\r\n    <!-- Check if it's an AMP page -->\r\n            <!-- Non-AMP version -->\r\n        <div class=\"mcq-container\" data-quiz-id=\"quizState_6a9f0c850856a\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"false\">\r\n                    Isocenter                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"true\">\r\n                    Principal point                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"false\">\r\n                    Perspective centre                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    Plumb line                <\/div>\r\n                            \r\n            <!-- Feedback messages for non-AMP -->\r\n            <div class=\"feedback\" data-feedback=\"wrong\">Answer is Right!<\/div>\r\n            <div class=\"feedback\" data-feedback=\"right\">Answer is Wrong!<\/div>\r\n        <\/div>\r\n\r\n        <script>\r\n        document.addEventListener('DOMContentLoaded', function () {\r\n            var containers = document.querySelectorAll('.mcq-container');\r\n\r\n            containers.forEach(function(container) {\r\n                var options = container.querySelectorAll('.option');\r\n                var feedbackSelect = container.querySelector('[data-feedback=\"select\"]');\r\n                var feedbackWrong = container.querySelector('[data-feedback=\"wrong\"]');\r\n                var feedbackRight = container.querySelector('[data-feedback=\"right\"]');\r\n\r\n                options.forEach(function(option) {\r\n                    option.addEventListener('click', function() {\r\n                        var selectedOption = option.getAttribute('data-option-key');\r\n                        var isCorrect = option.getAttribute('data-is-correct') === 'true';\r\n\r\n                        \/\/ Remove previous selections\r\n                        options.forEach(function(opt) {\r\n                            opt.classList.remove('correct', 'incorrect');\r\n                        });\r\n\r\n                        \/\/ Add the correct\/incorrect class\r\n                        if (isCorrect) {\r\n                            option.classList.add('correct');\r\n                            feedbackRight.hidden = false;\r\n                            feedbackWrong.hidden = true;\r\n                        } else {\r\n                            option.classList.add('incorrect');\r\n                            feedbackRight.hidden = true;\r\n                            feedbackWrong.hidden = false;\r\n                        }\r\n\r\n                        \/\/ Hide select feedback\r\n                        feedbackSelect.hidden = true;\r\n                    });\r\n                });\r\n            });\r\n        });\r\n        <\/script>\r\n    \r\n    <!--more--><\/p>\n<p>The correct answer is <strong>B. Principal point<\/strong>.<\/p>\n<p>The principal point is the foot of the perpendicular from the optical center of the camera lens to the image plane. It is a fixed point on the camera, and it does not change with the focus or zoom settings. The principal point is used to calculate the perspective distortion of an image.<\/p>\n<p>The isocenter is the point where the three principal axes of a camera intersect. It is a virtual point, and it does not exist in the real world. The isocenter is used <div class=\"youtube-subscribe-container\">\r\n        <a href=\"https:\/\/www.youtube.com\/channel\/UCNHT8lW-JmLC68rjBfZhdkg?sub_confirmation=1\" target=\"_blank\" class=\"youtube-subscribe-button\">\r\n            <span class=\"youtube-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\">\r\n                    <path d=\"M549.7 124.1c-6.3-23.7-24.8-42.3-48.3-48.6C458.8 64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Subscribe on YouTube\r\n        <\/a>\r\n    <\/div> to calculate the perspective distortion of an image, but it is not as important as the principal point.<\/p>\n<p>The perspective center is the point where the optical axis of the camera intersects the image plane. It is a virtual <div class=\"telegram-channel-container\">\r\n        <a href=\"https:\/\/t.me\/pscnotes2025\" target=\"_blank\" class=\"telegram-channel-button\">\r\n            <span class=\"telegram-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 496 512\">\r\n                    <path fill=\"white\" d=\"M248,8C111,8,0,119,0,256s111,248,248,248s248-111,248-248S385,8,248,8z M362,177L320,367c-3,14-10,18-20,14l-56-41l-27,26 c-3,3-5,5-10,5l4-63L323,196c5-5-1-7-8-3l-98,62l-42-13c-9-3-10-9,2-14l162-63C351,160,365,164,362,177z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Join Our Telegram Channel\r\n        <\/a>\r\n    <\/div> point, and it does not exist in the real world. The perspective center is used to calculate the perspective distortion of an image, but it is not as important as the principal point.<\/p>\n<p>The plumb line is a line that is perpendicular to the ground. It is used to measure the angle of elevation or depression of an object. The plumb line is not related to the principal point, and it is not used to calculate the perspective distortion of an image.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Join Our Telegram Channel Subscribe on YouTube<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[654],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as A. Isocenter B. Principal point C. Perspective centre D. Plumb line<\/title>\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-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as A. Isocenter B. Principal point C. Perspective centre D. Plumb line\" \/>\n<meta property=\"og:description\" content=\"Join Our Telegram Channel Subscribe on YouTube\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/the-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-15T02:57:10+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 foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as A. Isocenter B. Principal point C. Perspective centre D. Plumb line","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-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/","og_locale":"en_US","og_type":"article","og_title":"The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as A. Isocenter B. Principal point C. Perspective centre D. Plumb line","og_description":"Join Our Telegram Channel Subscribe on YouTube","og_url":"https:\/\/exam.pscnotes.com\/mcq\/the-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2024-04-15T02:57:10+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-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/","url":"https:\/\/exam.pscnotes.com\/mcq\/the-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/","name":"The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as A. Isocenter B. Principal point C. Perspective centre D. Plumb line","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2024-04-15T02:57:10+00:00","dateModified":"2024-04-15T02:57:10+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/the-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/the-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/the-foot-of-the-perpendicular-on-the-picture-plane-through-the-optical-centre-of-the-camera-lens-is-known-as-a-isocenter-b-principal-point-c-perspective-centre-d-plumb-line\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"mcq","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/mcq\/"},{"@type":"ListItem","position":3,"name":"Civil engineering","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/mcq\/civil-engineering\/"},{"@type":"ListItem","position":4,"name":"Surveying","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/mcq\/civil-engineering\/surveying\/"},{"@type":"ListItem","position":5,"name":"The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as A. Isocenter B. Principal point C. Perspective centre D. Plumb line"}]},{"@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\/d97f17072bfa490596c8f78363955d55?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/d97f17072bfa490596c8f78363955d55?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\/8236"}],"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=8236"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/8236\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=8236"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=8236"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=8236"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}