{"id":3933,"date":"2023-01-09T10:50:34","date_gmt":"2023-01-09T10:50:34","guid":{"rendered":"https:\/\/7thclass.deltapublications.in\/?page_id=3933"},"modified":"2024-12-13T06:30:11","modified_gmt":"2024-12-13T06:30:11","slug":"s-15-a-light-travels-along-a-straight-line","status":"publish","type":"page","link":"https:\/\/7thclass.deltapublications.in\/index.php\/s-15-a-light-travels-along-a-straight-line\/","title":{"rendered":"S-15.a Light Travels Along A Straight Line"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-text-align-center has-text-color\" style=\"color:#00056d;text-transform:uppercase\"><strong>Light Travels Along A Straight Line<\/strong><\/h2>\n\n\n\n<p class=\"has-text-color has-huge-font-size\" style=\"color:#74008b\"><strong>Key Notes :<\/strong><\/p>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-6e3a7cba51a136974c179acd2ba79b99\" style=\"color:#000060\">1. <strong>Nature of Light<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Light is a form of energy that allows us to see objects.<\/li>\n\n\n\n<li>Light travels in the form of waves, but it travels in straight lines in most situations, especially in a uniform medium.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-6309f3e27cf9b0e4cf2c4758df65b1b8\" style=\"color:#000060\">2. <strong>Straight Line Path<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>Light travels in a straight line unless it encounters an obstacle or medium that bends it (such as a lens or a mirror).<\/li>\n\n\n\n<li>This is called <strong>rectilinear propagation<\/strong>.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-f1efafedec5e6ed6a193cc4cbdb8c5ed\" style=\"color:#000060\">3. <strong>Shadow Formation<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>When an opaque object blocks the path of light, a shadow is formed.<\/li>\n\n\n\n<li>The shadow formed is always sharp and has clear boundaries because light travels in straight lines.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-4579a3a9d76e52274890de49ddbeb7e8\" style=\"color:#000060\">4. <strong>Reflection and Refraction<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>In reflection (e.g., when light bounces off a mirror), light still follows a straight-line path, obeying the laws of reflection (angle of incidence = angle of reflection).<\/li>\n\n\n\n<li>In refraction (e.g., when light passes through water or glass), the light bends but still follows a straight path before and after passing through the medium.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-d469c482f83306dabd5cb064ef231377\" style=\"color:#000060\">5. <strong>Demonstrations<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Laser Beam<\/strong>: A laser beam shows how light can travel in a straight line. You can observe a laser pointer&#8217;s beam traveling straight through air until it hits an object.<\/li>\n\n\n\n<li><strong>Pinhole Camera<\/strong>: A pinhole camera is an example of how light travels in straight lines. The image is formed on the opposite side of the box because the light travels in straight lines from the object through the pinhole.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-0f725baf4b99ef09690457850331e765\" style=\"color:#000060\">6. <strong>Application in Everyday Life<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li><strong>Mirrors<\/strong>: The straight-line travel of light is essential in the functioning of mirrors for reflection.<\/li>\n\n\n\n<li><strong>Periscopes<\/strong>: A periscope uses mirrors to reflect light in a straight line to help observe objects from a hidden position.<\/li>\n\n\n\n<li><strong>Telescopes<\/strong>: Telescopes use lenses or mirrors to focus light traveling in straight lines to view distant objects.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity is-style-wide\"\/>\n\n\n\n<h3 class=\"wp-block-heading has-text-color has-link-color has-large-font-size wp-elements-8a79c576b6a0bd70e7f24036eead17b0\" style=\"color:#000060\">7. <strong>Key Concept<\/strong>:<\/h3>\n\n\n\n<ul class=\"wp-block-list has-large-font-size\">\n<li>The straight-line travel of light helps explain many phenomena such as the formation of shadows, the clear images produced by lenses and mirrors, and the working of optical devices.<\/li>\n<\/ul>\n\n\n\n<p class=\"has-text-color has-large-font-size\" style=\"color:#a91f1f\"><strong>Let&#8217;s practice!<\/strong><\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/82459\/854\/233\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-74.png\" alt=\"\" class=\"wp-image-6069\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-74.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-74-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-74-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-3-74-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/wordwall.net\/play\/81732\/643\/913\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"500\" src=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-69.png\" alt=\"\" class=\"wp-image-6070\" srcset=\"https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-69.png 500w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-69-300x300.png 300w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-69-150x150.png 150w, https:\/\/7thclass.deltapublications.in\/wp-content\/uploads\/2023\/03\/Worksheet-1-1-2-69-400x400.png 400w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Light Travels Along A Straight Line Key Notes : 1. Nature of Light: 2. Straight Line Path: 3. Shadow Formation: 4. Reflection and Refraction: 5. Demonstrations: 6. Application in Everyday Life: 7. Key Concept: Let&#8217;s practice!<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"footnotes":""},"class_list":["post-3933","page","type-page","status-publish","hentry","entry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3933","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/comments?post=3933"}],"version-history":[{"count":14,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3933\/revisions"}],"predecessor-version":[{"id":15337,"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/pages\/3933\/revisions\/15337"}],"wp:attachment":[{"href":"https:\/\/7thclass.deltapublications.in\/index.php\/wp-json\/wp\/v2\/media?parent=3933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}