{"id":121341,"date":"2022-05-17T13:06:51","date_gmt":"2022-05-17T07:36:51","guid":{"rendered":"https:\/\/www.mapsofindia.com\/my-india\/?p=121341"},"modified":"2022-05-17T13:06:51","modified_gmt":"2022-05-17T07:36:51","slug":"the-focal-length-of-a-convex-lens-made-of-glass-of-refractive-index-1-5-is-20-cm-what-will-be-its-new-focal-length-when-placed-in-a-medium-of-refractive-index-1-25-is-focal-length-positive-or-neg","status":"publish","type":"post","link":"https:\/\/www.mapsofindia.com\/my-india\/education\/the-focal-length-of-a-convex-lens-made-of-glass-of-refractive-index-1-5-is-20-cm-what-will-be-its-new-focal-length-when-placed-in-a-medium-of-refractive-index-1-25-is-focal-length-positive-or-neg","title":{"rendered":"The focal length of a convex lens made of glass of refractive index (1.5) is 20 cm. What will be its new focal length when placed in a medium of refractive index 1.25 ? Is focal length positive or negative? What does it signify?"},"content":{"rendered":"<h2>The focal length of a convex lens made of glass of refractive index (1.5) is 20 cm. What will be its new focal length when placed in a medium of refractive index 1.25 ?<br \/>\nIs focal length positive or negative? What does it signify?<\/h2>\n<h3>ANS 10 Given a\u0b9c\u0c5d = 1.5<br \/>\nFocal length of the given convex lens when it is placed in air is<br \/>\nf = + 20 cm Refractive index of the given medium with respect to air is<br \/>\na\u0b9c\u0c63 = 1.25 New focal length of the given convex lens when placed in a<br \/>\nmedium is f<br \/>\n\u11f1<\/h3>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-121342 size-full\" src=\"https:\/\/www.mapsofindia.com\/ci-moi-images\/my-india\/2022\/05\/17-12.png\" alt=\"\" width=\"436\" height=\"202\" srcset=\"https:\/\/www.mapsofindia.com\/ci-moi-images\/my-india\/2022\/05\/17-12.png 436w, https:\/\/www.mapsofindia.com\/ci-moi-images\/my-india\/2022\/05\/17-12-150x69.png 150w, https:\/\/www.mapsofindia.com\/ci-moi-images\/my-india\/2022\/05\/17-12-300x139.png 300w\" sizes=\"auto, (max-width: 436px) 100vw, 436px\" \/><\/p>\n<h3>New focal length is positive. The significance of the positive sign of the focal length is that given convex lens is still converging in the given medium.<\/h3>\n","protected":false},"excerpt":{"rendered":"<p>The focal length of a convex lens made of glass of refractive index (1.5) is 20 cm. What will be its new focal length when placed in a medium of refractive index 1.25 ? Is focal length positive or negative? What does it signify? ANS 10 Given a\u0b9c\u0c5d = 1.5 Focal length of the given [&hellip;]<\/p>\n","protected":false},"author":21830,"featured_media":121296,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":{"0":"post-121341","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-education"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/posts\/121341","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/users\/21830"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/comments?post=121341"}],"version-history":[{"count":1,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/posts\/121341\/revisions"}],"predecessor-version":[{"id":121343,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/posts\/121341\/revisions\/121343"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/media\/121296"}],"wp:attachment":[{"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/media?parent=121341"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/categories?post=121341"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mapsofindia.com\/my-india\/wp-json\/wp\/v2\/tags?post=121341"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}