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Фокус (фізіка) — Вікіпедыя
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href="/wiki/%D0%92%D1%96%D0%BA%D1%96%D0%BF%D0%B5%D0%B4%D1%8B%D1%8F:%D0%A1%D1%83%D0%BF%D0%BE%D0%BB%D1%8C%D0%BD%D0%B0%D1%81%D1%86%D1%8C" title="Пра праект, чым можна заняцца, дзе што шукаць"><span>Супольнасць</span></a></li><li id="n-recentchanges" class="mw-list-item"><a href="/wiki/%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:RecentChanges" title="Пералік нядаўніх змяненняў у віксе. [r]" accesskey="r"><span>Апошнія змены</span></a></li><li id="n-newpages" class="mw-list-item"><a href="/wiki/%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:NewPages"><span>Новыя старонкі</span></a></li><li id="n-Village-pump" class="mw-list-item"><a href="/wiki/%D0%92%D1%96%D0%BA%D1%96%D0%BF%D0%B5%D0%B4%D1%8B%D1%8F:%D0%A4%D0%BE%D1%80%D1%83%D0%BC"><span>Форум</span></a></li><li id="n-randompage" class="mw-list-item"><a href="/wiki/%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:Random" title="Паказаць выпадковую старонку [x]" accesskey="x"><span>Выпадковая старонка</span></a></li><li id="n-help" class="mw-list-item"><a href="/wiki/%D0%92%D1%96%D0%BA%D1%96%D0%BF%D0%B5%D0%B4%D1%8B%D1%8F:%D0%94%D0%B0%D0%B2%D0%B5%D0%B4%D0%BA%D0%B0" title="Дзе можна атрымаць тлумачэнні."><span>Даведка</span></a></li><li id="n-bug_in_article" class="mw-list-item"><a href="/wiki/%D0%92%D1%96%D0%BA%D1%96%D0%BF%D0%B5%D0%B4%D1%8B%D1%8F:%D0%9F%D0%B0%D0%B2%D0%B5%D0%B4%D0%B0%D0%BC%D0%BB%D0%B5%D0%BD%D0%BD%D1%96_%D0%BF%D1%80%D0%B0_%D0%BF%D0%B0%D0%BC%D1%8B%D0%BB%D0%BA%D1%96"><span>Паведаміць пра памылку</span></a></li> </ul> </div> </div> </div> </div> </div> </div> </nav> <a href="/wiki/%D0%93%D0%B0%D0%BB%D0%BE%D1%9E%D0%BD%D0%B0%D1%8F_%D1%81%D1%82%D0%B0%D1%80%D0%BE%D0%BD%D0%BA%D0%B0" class="mw-logo"> <img class="mw-logo-icon" src="/static/images/icons/wikipedia.png" alt="" aria-hidden="true" height="50" width="50"> <span class="mw-logo-container skin-invert"> <img class="mw-logo-wordmark" alt="Вікіпедыя" src="/static/images/mobile/copyright/wikipedia-wordmark-be.svg" style="width: 7.625em; height: 1.3125em;"> <img class="mw-logo-tagline" alt="" src="/static/images/mobile/copyright/wikipedia-tagline-be.svg" width="117" height="12" style="width: 7.3125em; height: 0.75em;"> </span> </a> </div> <div class="vector-header-end"> <div id="p-search" role="search" class="vector-search-box-vue vector-search-box-collapses vector-search-box-show-thumbnail vector-search-box-auto-expand-width vector-search-box"> <a href="/wiki/%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:Search" class="cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only search-toggle" title="Знайсці ў Вікіпедыі [f]" accesskey="f"><span class="vector-icon mw-ui-icon-search mw-ui-icon-wikimedia-search"></span> <span>Пошук</span> </a> <div class="vector-typeahead-search-container"> <div class="cdx-typeahead-search cdx-typeahead-search--show-thumbnail cdx-typeahead-search--auto-expand-width"> <form action="/w/index.php" id="searchform" class="cdx-search-input cdx-search-input--has-end-button"> <div id="simpleSearch" class="cdx-search-input__input-wrapper" data-search-loc="header-moved"> <div class="cdx-text-input cdx-text-input--has-start-icon"> <input class="cdx-text-input__input" type="search" name="search" placeholder="Шукаць у Вікіпедыі" aria-label="Шукаць у Вікіпедыі" autocapitalize="sentences" title="Знайсці ў Вікіпедыі [f]" accesskey="f" id="searchInput" > <span class="cdx-text-input__icon cdx-text-input__start-icon"></span> </div> <input type="hidden" name="title" value="Адмысловае:Search"> </div> <button class="cdx-button cdx-search-input__end-button">Пошук</button> </form> </div> </div> </div> <nav class="vector-user-links vector-user-links-wide" aria-label="Асабістыя інструменты"> <div class="vector-user-links-main"> <div id="p-vector-user-menu-preferences" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Выгляд"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Выгляд" > <label id="vector-appearance-dropdown-label" for="vector-appearance-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-appearance mw-ui-icon-wikimedia-appearance"></span> <span class="vector-dropdown-label-text">Выгляд</span> </label> <div class="vector-dropdown-content"> <div id="vector-appearance-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <div id="p-vector-user-menu-notifications" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <div id="p-vector-user-menu-overflow" class="vector-menu mw-portlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_be.wikipedia.org&uselang=be" class=""><span>Ахвяраваць</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:CreateAccount&returnto=%D0%A4%D0%BE%D0%BA%D1%83%D1%81+%28%D1%84%D1%96%D0%B7%D1%96%D0%BA%D0%B0%29" title="Вам прапануецца стварыць уліковы запіс і ўвайсці ў сістэму, але гэта не абавязкова" class=""><span>Стварыць уліковы запіс</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:UserLogin&returnto=%D0%A4%D0%BE%D0%BA%D1%83%D1%81+%28%D1%84%D1%96%D0%B7%D1%96%D0%BA%D0%B0%29" title="Вам прапануецца ўвайсці ў сістэму, але гэта неабавязкова. [o]" accesskey="o" class=""><span>Увайсці</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="Больш магчымасцей" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Асабістыя інструменты" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Асабістыя інструменты</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="Меню ўдзельніка" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="//donate.wikimedia.org/wiki/Special:FundraiserRedirector?utm_source=donate&utm_medium=sidebar&utm_campaign=C13_be.wikipedia.org&uselang=be"><span>Ахвяраваць</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:CreateAccount&returnto=%D0%A4%D0%BE%D0%BA%D1%83%D1%81+%28%D1%84%D1%96%D0%B7%D1%96%D0%BA%D0%B0%29" title="Вам прапануецца стварыць уліковы запіс і ўвайсці ў сістэму, але гэта не абавязкова"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Стварыць уліковы запіс</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:UserLogin&returnto=%D0%A4%D0%BE%D0%BA%D1%83%D1%81+%28%D1%84%D1%96%D0%B7%D1%96%D0%BA%D0%B0%29" title="Вам прапануецца ўвайсці ў сістэму, але гэта неабавязкова. [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Увайсці</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Старонкі для ананімных рэдактараў <a href="/wiki/%D0%94%D0%B0%D0%B2%D0%B5%D0%B4%D0%BA%D0%B0:%D0%94%D0%B0%D0%B2%D0%B5%D0%B4%D0%BA%D0%B0" aria-label="Даведацца больш пра праўку"><span>даведацца больш</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:MyContributions" title="Спіс правак, зробленых з гэтага IP-адраса [y]" accesskey="y"><span>Уклад</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:MyTalk" title="Размовы пра праўкі, зробленыя з гэтага IP-адраса [n]" accesskey="n"><span>Размовы</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"><!-- CentralNotice --></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Праект"> <div id="vector-main-menu-pinned-container" class="vector-pinned-container"> </div> </nav> </div> </div> <div class="vector-sticky-pinned-container"> <nav id="mw-panel-toc" aria-label="Змест" data-event-name="ui.sidebar-toc" class="mw-table-of-contents-container vector-toc-landmark"> <div id="vector-toc-pinned-container" class="vector-pinned-container"> <div id="vector-toc" class="vector-toc vector-pinnable-element"> <div class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">Змест</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">перанесці да бакавой панэлі</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">схаваць</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Пачатак</div> </a> </li> <li id="toc-Гл._таксама" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Гл._таксама"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Гл. таксама</span> </div> </a> <ul id="toc-Гл._таксама-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Зноскі" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Зноскі"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Зноскі</span> </div> </a> <ul id="toc-Зноскі-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Змест" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Пераключыць змест" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Пераключыць змест</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Фокус (фізіка)</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Перайсці да артыкула на іншай мове. Даступны на 51 мове." > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-51" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">51 мова</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-af mw-list-item"><a href="https://af.wikipedia.org/wiki/Fokus" title="Fokus – афрыкаанс" lang="af" hreflang="af" data-title="Fokus" data-language-autonym="Afrikaans" data-language-local-name="афрыкаанс" class="interlanguage-link-target"><span>Afrikaans</span></a></li><li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%A8%D8%A4%D8%B1%D8%A9_%D8%A7%D9%84%D8%B9%D8%AF%D8%B3%D8%A9" title="بؤرة العدسة – арабская" lang="ar" hreflang="ar" data-title="بؤرة العدسة" data-language-autonym="العربية" data-language-local-name="арабская" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%A4%D0%BE%D0%BA%D1%83%D1%81_(%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0)" title="Фокус (оптика) – балгарская" lang="bg" hreflang="bg" data-title="Фокус (оптика)" data-language-autonym="Български" data-language-local-name="балгарская" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/Fokus" title="Fokus – баснійская" lang="bs" hreflang="bs" data-title="Fokus" data-language-autonym="Bosanski" data-language-local-name="баснійская" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Focus_(%C3%B2ptica)" title="Focus (òptica) – каталанская" lang="ca" hreflang="ca" data-title="Focus (òptica)" data-language-autonym="Català" data-language-local-name="каталанская" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Fokus" title="Fokus – нямецкая" lang="de" hreflang="de" data-title="Fokus" data-language-autonym="Deutsch" data-language-local-name="нямецкая" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Focus_(optics)" title="Focus (optics) – англійская" lang="en" hreflang="en" data-title="Focus (optics)" data-language-autonym="English" data-language-local-name="англійская" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Fokuso_(optiko)" title="Fokuso (optiko) – эсперанта" lang="eo" hreflang="eo" data-title="Fokuso (optiko)" data-language-autonym="Esperanto" data-language-local-name="эсперанта" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Foco_(%C3%B3ptica)" title="Foco (óptica) – іспанская" lang="es" hreflang="es" data-title="Foco (óptica)" data-language-autonym="Español" data-language-local-name="іспанская" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Fookus" title="Fookus – эстонская" lang="et" hreflang="et" data-title="Fookus" data-language-autonym="Eesti" data-language-local-name="эстонская" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Foku_(optika)" title="Foku (optika) – баскская" lang="eu" hreflang="eu" data-title="Foku (optika)" data-language-autonym="Euskara" data-language-local-name="баскская" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%A9%D8%A7%D9%86%D9%88%D9%86_%D8%B9%D8%AF%D8%B3%DB%8C" title="کانون عدسی – фарсі" lang="fa" hreflang="fa" data-title="کانون عدسی" data-language-autonym="فارسی" data-language-local-name="фарсі" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Polttopiste" title="Polttopiste – фінская" lang="fi" hreflang="fi" data-title="Polttopiste" data-language-autonym="Suomi" data-language-local-name="фінская" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Foyer_(optique)" title="Foyer (optique) – французская" lang="fr" hreflang="fr" data-title="Foyer (optique)" data-language-autonym="Français" data-language-local-name="французская" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ga mw-list-item"><a href="https://ga.wikipedia.org/wiki/F%C3%B3cas_(optaic)" title="Fócas (optaic) – ірландская" lang="ga" hreflang="ga" data-title="Fócas (optaic)" data-language-autonym="Gaeilge" data-language-local-name="ірландская" class="interlanguage-link-target"><span>Gaeilge</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%9E%D7%95%D7%A7%D7%93_(%D7%90%D7%95%D7%A4%D7%98%D7%99%D7%A7%D7%94)" title="מוקד (אופטיקה) – іўрыт" lang="he" hreflang="he" data-title="מוקד (אופטיקה)" data-language-autonym="עברית" data-language-local-name="іўрыт" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/%C5%BDari%C5%A1te" title="Žarište – харвацкая" lang="hr" hreflang="hr" data-title="Žarište" data-language-autonym="Hrvatski" data-language-local-name="харвацкая" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D4%BF%D5%AB%D5%A6%D5%A1%D5%AF%D5%A5%D5%BF" title="Կիզակետ – армянская" lang="hy" hreflang="hy" data-title="Կիզակետ" data-language-autonym="Հայերեն" data-language-local-name="армянская" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Titik_api" title="Titik api – інданезійская" lang="id" hreflang="id" data-title="Titik api" data-language-autonym="Bahasa Indonesia" data-language-local-name="інданезійская" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-io mw-list-item"><a href="https://io.wikipedia.org/wiki/Foko_(optiko)" title="Foko (optiko) – іда" lang="io" hreflang="io" data-title="Foko (optiko)" data-language-autonym="Ido" data-language-local-name="іда" class="interlanguage-link-target"><span>Ido</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Fuoco_(ottica)" title="Fuoco (ottica) – італьянская" lang="it" hreflang="it" data-title="Fuoco (ottica)" data-language-autonym="Italiano" data-language-local-name="італьянская" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E7%84%A6%E7%82%B9_(%E5%85%89%E5%AD%A6)" title="焦点 (光学) – японская" lang="ja" hreflang="ja" data-title="焦点 (光学)" data-language-autonym="日本語" data-language-local-name="японская" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%A4%D0%BE%D0%BA%D1%83%D1%81_(%D1%84%D0%B8%D0%B7%D0%B8%D0%BA%D0%B0)" title="Фокус (физика) – казахская" lang="kk" hreflang="kk" data-title="Фокус (физика)" data-language-autonym="Қазақша" data-language-local-name="казахская" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%B4%88%EC%A0%90_(%EA%B4%91%ED%95%99)" title="초점 (광학) – карэйская" lang="ko" hreflang="ko" data-title="초점 (광학)" data-language-autonym="한국어" data-language-local-name="карэйская" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-lb mw-list-item"><a href="https://lb.wikipedia.org/wiki/Fokus" title="Fokus – люксембургская" lang="lb" hreflang="lb" data-title="Fokus" data-language-autonym="Lëtzebuergesch" data-language-local-name="люксембургская" class="interlanguage-link-target"><span>Lëtzebuergesch</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Fokuss_(optika)" title="Fokuss (optika) – латышская" lang="lv" hreflang="lv" data-title="Fokuss (optika)" data-language-autonym="Latviešu" data-language-local-name="латышская" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%96%D0%B0%D1%80%D0%B8%D1%88%D1%82%D0%B5_(%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0)" title="Жариште (оптика) – македонская" lang="mk" hreflang="mk" data-title="Жариште (оптика)" data-language-autonym="Македонски" data-language-local-name="македонская" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%AB%E0%B5%8B%E0%B4%95%E0%B5%8D%E0%B4%95%E0%B4%B8%E0%B5%8D_(%E0%B4%AA%E0%B5%8D%E0%B4%B0%E0%B4%95%E0%B4%BE%E0%B4%B6%E0%B4%B6%E0%B4%BE%E0%B4%B8%E0%B5%8D%E0%B4%A4%E0%B5%8D%E0%B4%B0%E0%B4%82)" title="ഫോക്കസ് (പ്രകാശശാസ്ത്രം) – малаялам" lang="ml" hreflang="ml" data-title="ഫോക്കസ് (പ്രകാശശാസ്ത്രം)" data-language-autonym="മലയാളം" data-language-local-name="малаялам" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%A4%D0%BE%D0%BA%D1%83%D1%81_(%D0%BE%D0%BF%D1%82%D0%B8%D0%BA)" title="Фокус (оптик) – мангольская" lang="mn" hreflang="mn" data-title="Фокус (оптик)" data-language-autonym="Монгол" data-language-local-name="мангольская" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Brandpunt_(optica)" title="Brandpunt (optica) – нідэрландская" lang="nl" hreflang="nl" data-title="Brandpunt (optica)" data-language-autonym="Nederlands" data-language-local-name="нідэрландская" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-nn mw-list-item"><a href="https://nn.wikipedia.org/wiki/Fokus_i_fysikk" title="Fokus i fysikk – нарвежская (нюношк)" lang="nn" hreflang="nn" data-title="Fokus i fysikk" data-language-autonym="Norsk nynorsk" data-language-local-name="нарвежская (нюношк)" class="interlanguage-link-target"><span>Norsk nynorsk</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Fokus_(optikk)" title="Fokus (optikk) – нарвежская (букмол)" lang="nb" hreflang="nb" data-title="Fokus (optikk)" data-language-autonym="Norsk bokmål" data-language-local-name="нарвежская (букмол)" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Ognisko_(optyka)" title="Ognisko (optyka) – польская" lang="pl" hreflang="pl" data-title="Ognisko (optyka)" data-language-autonym="Polski" data-language-local-name="польская" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Foco" title="Foco – партугальская" lang="pt" hreflang="pt" data-title="Foco" data-language-autonym="Português" data-language-local-name="партугальская" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Focar_(optic%C4%83)" title="Focar (optică) – румынская" lang="ro" hreflang="ro" data-title="Focar (optică)" data-language-autonym="Română" data-language-local-name="румынская" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A4%D0%BE%D0%BA%D1%83%D1%81_(%D1%84%D0%B8%D0%B7%D0%B8%D0%BA%D0%B0)" title="Фокус (физика) – руская" lang="ru" hreflang="ru" data-title="Фокус (физика)" data-language-autonym="Русский" data-language-local-name="руская" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/Fokus" title="Fokus – сербскахарвацкая" lang="sh" hreflang="sh" data-title="Fokus" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="сербскахарвацкая" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/Focus_(optics)" title="Focus (optics) – Simple English" lang="en-simple" hreflang="en-simple" data-title="Focus (optics)" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Ohnisko_(optika)" title="Ohnisko (optika) – славацкая" lang="sk" hreflang="sk" data-title="Ohnisko (optika)" data-language-autonym="Slovenčina" data-language-local-name="славацкая" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/Gori%C5%A1%C4%8De_(optika)" title="Gorišče (optika) – славенская" lang="sl" hreflang="sl" data-title="Gorišče (optika)" data-language-autonym="Slovenščina" data-language-local-name="славенская" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/%D0%A4%D0%BE%D0%BA%D1%83%D1%81_(%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0)" title="Фокус (оптика) – сербская" lang="sr" hreflang="sr" data-title="Фокус (оптика)" data-language-autonym="Српски / srpski" data-language-local-name="сербская" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/Fokus_(optik)" title="Fokus (optik) – шведская" lang="sv" hreflang="sv" data-title="Fokus (optik)" data-language-autonym="Svenska" data-language-local-name="шведская" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%95%E0%AF%81%E0%AE%B5%E0%AE%BF%E0%AE%AF%E0%AE%AE%E0%AF%8D_(%E0%AE%92%E0%AE%B3%E0%AE%BF%E0%AE%AF%E0%AE%BF%E0%AE%AF%E0%AE%B2%E0%AF%8D)" title="குவியம் (ஒளியியல்) – тамільская" lang="ta" hreflang="ta" data-title="குவியம் (ஒளியியல்)" data-language-autonym="தமிழ்" data-language-local-name="тамільская" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-te mw-list-item"><a href="https://te.wikipedia.org/wiki/%E0%B0%95%E0%B0%9F%E0%B0%95_%E0%B0%A8%E0%B0%BE%E0%B0%AD%E0%B0%BF" title="కటక నాభి – тэлугу" lang="te" hreflang="te" data-title="కటక నాభి" data-language-autonym="తెలుగు" data-language-local-name="тэлугу" class="interlanguage-link-target"><span>తెలుగు</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Odak_(optik)" title="Odak (optik) – турэцкая" lang="tr" hreflang="tr" data-title="Odak (optik)" data-language-autonym="Türkçe" data-language-local-name="турэцкая" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%A4%D0%BE%D0%BA%D1%83%D1%81_(%D0%BE%D0%BF%D1%82%D0%B8%D0%BA%D0%B0)" title="Фокус (оптика) – украінская" lang="uk" hreflang="uk" data-title="Фокус (оптика)" data-language-autonym="Українська" data-language-local-name="украінская" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-ur mw-list-item"><a href="https://ur.wikipedia.org/wiki/%D9%85%D8%A7%D8%B3%DA%A9%DB%81%D8%A1_%D8%AE%D8%A7%D8%B5" title="ماسکہء خاص – урду" lang="ur" hreflang="ur" data-title="ماسکہء خاص" data-language-autonym="اردو" data-language-local-name="урду" class="interlanguage-link-target"><span>اردو</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Fokus" title="Fokus – узбекская" lang="uz" hreflang="uz" data-title="Fokus" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="узбекская" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Ti%C3%AAu_%C4%91i%E1%BB%83m" title="Tiêu điểm – в’етнамская" lang="vi" hreflang="vi" data-title="Tiêu điểm" data-language-autonym="Tiếng Việt" data-language-local-name="в’етнамская" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E7%84%A6%E9%BB%9E" title="焦點 – кітайская" lang="zh" hreflang="zh" data-title="焦點" data-language-autonym="中文" data-language-local-name="кітайская" class="interlanguage-link-target"><span>中文</span></a></li><li class="interlanguage-link interwiki-zh-yue mw-list-item"><a href="https://zh-yue.wikipedia.org/wiki/%E7%84%A6%E9%BB%9E" title="焦點 – кантонскі дыялект кітайскай" lang="yue" hreflang="yue" data-title="焦點" data-language-autonym="粵語" data-language-local-name="кантонскі дыялект кітайскай" class="interlanguage-link-target"><span>粵語</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q190909#sitelinks-wikipedia" title="Правіць міжмоўныя спасылкі" 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Вікіпедыі, свабоднай энцыклапедыі</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="be" dir="ltr"><div class="hatnote navigation-not-searchable noprint dabhide">У паняцця ёсць і іншыя значэнні, гл. <a href="/wiki/%D0%A4%D0%BE%D0%BA%D1%83%D1%81" class="mw-disambig" title="Фокус">Фокус</a>.</div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/%D0%A4%D0%B0%D0%B9%D0%BB:Parabola_with_focus_and_arbitrary_line.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Parabola_with_focus_and_arbitrary_line.svg/220px-Parabola_with_focus_and_arbitrary_line.svg.png" decoding="async" width="220" height="150" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Parabola_with_focus_and_arbitrary_line.svg/330px-Parabola_with_focus_and_arbitrary_line.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Parabola_with_focus_and_arbitrary_line.svg/440px-Parabola_with_focus_and_arbitrary_line.svg.png 2x" data-file-width="880" data-file-height="600" /></a><figcaption><a href="/wiki/%D0%9F%D0%B0%D1%80%D0%B0%D0%B1%D0%B0%D0%BB%D0%B0" title="Парабала">Парабала</a> (ці <a href="/w/index.php?title=%D0%9F%D0%B0%D1%80%D0%B0%D0%B1%D0%B0%D0%BB%D0%BE%D1%96%D0%B4&action=edit&redlink=1" class="new" title="Парабалоід (няма такой старонкі)">парабалоід</a> вярчэння) факусуе паралельны пучок прамянёў у адзін пункт</figcaption></figure> <p><b>Фо́кус</b> (ад <a href="/wiki/%D0%9B%D0%B0%D1%86%D1%96%D0%BD%D1%81%D0%BA%D0%B0%D1%8F_%D0%BC%D0%BE%D0%B2%D0%B0" title="Лацінская мова">лац.</a>: <span style="font-style: italic;" lang="la">focus</span> — «ачаг») аптычнай (можа працаваць з іншымі відамі <a href="/wiki/%D0%92%D1%8B%D0%BF%D1%80%D0%B0%D0%BC%D0%B5%D0%BD%D1%8C%D0%B2%D0%B0%D0%BD%D0%BD%D0%B5" title="Выпраменьванне">выпраменьвання</a>) сістэмы — пункт, у якім перасякаюцца (<i>«факусуюцца»</i>) першапачаткова паралельныя <a href="/w/index.php?title=%D0%9F%D1%80%D0%B0%D0%BC%D0%B5%D0%BD%D1%8C,_%D1%85%D0%B2%D0%B0%D0%BB%D1%96&action=edit&redlink=1" class="new" title="Прамень, хвалі (няма такой старонкі)">промні</a> пасля праходжання праз збіральная сістэму (або дзе перасякаюцца іх працягі, калі сістэма рассейвальная). Мноства фокусаў сістэмы вызначае яе факальную паверхню. Галоўны фокус сістэмы з'яўляецца скрыжаваннем яе галоўнай <a href="/wiki/%D0%90%D0%BF%D1%82%D1%8B%D1%87%D0%BD%D0%B0%D1%8F_%D0%B2%D0%BE%D1%81%D1%8C" class="mw-disambig" title="Аптычная вось">аптычнай восі</a> і факальнай паверхні. У наш час<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>, замест тэрміна <b>галоўны фокус</b> (пярэдні ці задні) выкарыстоўваюцца тэрміны <i>задні фокус</i> і <i>пярэдні фокус</i>. </p> <div class="mw-heading mw-heading2"><h2 id="Гл._таксама"><span id=".D0.93.D0.BB._.D1.82.D0.B0.D0.BA.D1.81.D0.B0.D0.BC.D0.B0"></span>Гл. таксама</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%D0%A4%D0%BE%D0%BA%D1%83%D1%81_(%D1%84%D1%96%D0%B7%D1%96%D0%BA%D0%B0)&veaction=edit&section=1" title="Правіць раздзел: Гл. таксама" class="mw-editsection-visualeditor"><span>правіць</span></a><span class="mw-editsection-divider"> | </span><a href="/w/index.php?title=%D0%A4%D0%BE%D0%BA%D1%83%D1%81_(%D1%84%D1%96%D0%B7%D1%96%D0%BA%D0%B0)&action=edit&section=1" title="Правіць зыходнік раздзела: Гл. таксама"><span>правіць зыходнік</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/%D0%9B%D1%96%D0%BD%D0%B7%D0%B0" title="Лінза">Лінза</a></li> <li><a href="/w/index.php?title=%D0%A0%D1%8D%D1%84%D0%BB%D0%B5%D0%BA%D1%82%D0%B0%D1%80,_%D0%BB%D1%8E%D1%81%D1%82%D1%8D%D1%80%D0%BA%D0%B0&action=edit&redlink=1" class="new" title="Рэфлектар, люстэрка (няма такой старонкі)">Рэфлектар</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Зноскі"><span id=".D0.97.D0.BD.D0.BE.D1.81.D0.BA.D1.96"></span>Зноскі</h2></div> <div class="reflist columns" style="list-style-type: decimal;"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text">ГОСТ 7427-76. ГЕОМЕТРИЧЕСКАЯ ОПТИКА Термины, определения и буквенные обозначения</span> </li> </ol></div> </div></div><!--esi <esi:include src="/esitest-fa8a495983347898/content" /> --><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1&useformat=desktop" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Узята з "<a dir="ltr" href="https://be.wikipedia.org/w/index.php?title=Фокус_(фізіка)&oldid=3491250">https://be.wikipedia.org/w/index.php?title=Фокус_(фізіка)&oldid=3491250</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/%D0%90%D0%B4%D0%BC%D1%8B%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D0%B5:Categories" title="Адмысловае:Categories">Катэгорыі</a>: <ul><li><a href="/wiki/%D0%9A%D0%B0%D1%82%D1%8D%D0%B3%D0%BE%D1%80%D1%8B%D1%8F:%D0%A5%D0%B2%D0%B0%D0%BB%D0%B5%D0%B2%D0%B0%D1%8F_%D1%84%D1%96%D0%B7%D1%96%D0%BA%D0%B0" title="Катэгорыя:Хвалевая фізіка">Хвалевая фізіка</a></li><li><a href="/wiki/%D0%9A%D0%B0%D1%82%D1%8D%D0%B3%D0%BE%D1%80%D1%8B%D1%8F:%D0%9E%D0%BF%D1%82%D1%8B%D0%BA%D0%B0" title="Катэгорыя:Оптыка">Оптыка</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> Апошняе змяненне старонкі адбылося 07:51, 7 лістапада 2019.</li> <li id="footer-info-copyright">Тэкст даступны на ўмовах <a rel="nofollow" class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.be">ліцэнзіі Creative Commons Attribution-ShareAlike</a>, у асобных выпадках могуць дзейнічаць дадатковыя ўмовы. 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