{"id":63349,"date":"2026-05-13T04:18:16","date_gmt":"2026-05-12T19:18:16","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=63349"},"modified":"2026-05-13T04:18:16","modified_gmt":"2026-05-12T19:18:16","slug":"why-does-light-bend-the-secret-of-waves-discovered-by-a-17th-century-genius-huygens-principle","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=63349&lang=en","title":{"rendered":"Why Does Light Bend? The Secret of Waves Discovered by a 17th-Century Genius (Huygens&#8217; Principle)"},"content":{"rendered":"<p style=\"text-align: center;\"><span style=\"color: #339966;\"><strong>I\u2019m Ken Kuwako from Science Trainer. Every day is an experiment.<\/strong><\/span><\/p>\n<p>Have you ever heard that light can bend? The bottom of a swimming pool looks shallower than it really is, and a straw in a glass of water appears broken. These are all caused by light changing direction. But surprisingly few people can explain why it happens.<\/p>\n<p>Today, we\u2019re going to uncover the mystery using the ideas of a Dutch scientist who figured it out more than 350 years ago. First, take a look at this video. Water is below, air is above.<\/p>\n<p><iframe loading=\"lazy\" title=\"\u5149\u7dda\u3092\u6c34\u306b\u5165\u308c\u3066\u307f\u308b\u3068\u2026!!\u3010\u5149\u306e\u5c48\u6298\u30fb\u53cd\u5c04\u30fb\u5168\u53cd\u5c04\u3011\" width=\"1140\" height=\"641\" src=\"https:\/\/www.youtube.com\/embed\/CCO57Dh9RBU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h3>What Is Huygens\u2019 Principle?<\/h3>\n<p>One of the most elegant ways to explain why light bends is through <b>Huygens\u2019 Principle<\/b>. Proposed in 1678 by the Dutch scientist <b>Christiaan Huygens<\/b>, this idea explains how waves spread by imagining them as collections of countless tiny waves called <b>wavelets<\/b>.<\/p>\n<p>Using this principle, we can not only explain refraction, but even derive the laws of light mathematically.<\/p>\n<h3>What Are Wavelets?<\/h3>\n<p>Drop a stone into a pond, and circular ripples spread outward. Each tiny expanding circle can be thought of as a <b>wavelet<\/b>.<\/p>\n<p style=\"text-align: center;\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35446\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/a494aa09e82aa199eb22b7af45a0e473.jpg\" alt=\"\" width=\"220\" height=\"217\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/a494aa09e82aa199eb22b7af45a0e473.jpg 518w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/a494aa09e82aa199eb22b7af45a0e473-300x297.jpg 300w\" sizes=\"auto, (max-width: 220px) 100vw, 220px\" \/><\/p>\n<p>But then, why do straight waves appear when you strike the water with a stick?<\/p>\n<p>According to Huygens\u2019 Principle, those straight wavefronts are actually formed by <b>huge numbers of overlapping wavelets<\/b>. Watch this video:<\/p>\n<p><iframe loading=\"lazy\" title=\"\u898b\u308c\u3070\u4e00\u767a\uff01\u30db\u30a4\u30d8\u30f3\u30b9\u306e\u539f\u7406\u306e\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\" width=\"1140\" height=\"855\" src=\"https:\/\/www.youtube.com\/embed\/cP9EYKYwp6k?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>You can clearly see how countless tiny circular waves combine to create a flat wavefront. That\u2019s the beauty of Huygens\u2019 Principle: one simple idea can explain almost every kind of wave motion.<\/p>\n<h3>Diffraction \u2014 Waves Can Bend Around Obstacles<\/h3>\n<p>When waves pass through a narrow opening in a wall or breakwater, they spread out and curve around the edges. This phenomenon is called <b>diffraction<\/b>.<\/p>\n<p>Through Huygens\u2019 Principle, this becomes easy to understand: the opening itself acts as a new source of wavelets, causing the waves to spread outward in circles.<\/p>\n<p><iframe loading=\"lazy\" title=\"\u30db\u30a4\u30d8\u30f3\u30b9\u306e\u539f\u7406\u3068\u6ce2\u306e\u56de\u6298\u306e\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u6559\u6750\" width=\"1140\" height=\"855\" src=\"https:\/\/www.youtube.com\/embed\/tvyv_D3_DaA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h3>Reflection \u2014 Why Is the Angle of Incidence Equal to the Angle of Reflection?<\/h3>\n<p>Light bouncing off a mirror at the same angle it arrived may seem obvious, but Huygens\u2019 Principle gives a beautiful explanation.<\/p>\n<p>As wavelets strike the reflective surface, they generate new waves. The combined shape of these waves naturally produces a reflected wavefront, leading directly to the rule that <b>the angle of incidence equals the angle of reflection<\/b>.<\/p>\n<p><iframe loading=\"lazy\" title=\"\u53cd\u5c04\u306e\u6cd5\u5247\u304c\u307e\u308b\u308f\u304b\u308a\uff01\u300c\u30db\u30a4\u30d8\u30f3\u30b9\u306e\u539f\u7406\u300d\" width=\"1140\" height=\"855\" src=\"https:\/\/www.youtube.com\/embed\/K238omzCh1M?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h3>Refraction \u2014 When Speed Changes, Waves Bend<\/h3>\n<p>Now for the main event: why does refraction happen?<\/p>\n<p>The key is <b>wave speed<\/b>.<\/p>\n<p>Light travels more slowly in water than in air. When a wavefront enters water at an angle, the part that reaches the water first slows down while the rest is still moving quickly through the air. This difference in speed gradually rotates the entire wavefront.<\/p>\n<p>That slow turning motion is exactly what we call refraction.<\/p>\n<p><iframe loading=\"lazy\" title=\"[THE\u5b9a\u756a]\u5c48\u6298\u306e\u6cd5\u5247\u3068\u30db\u30a4\u30d8\u30f3\u30b9\u306e\u539f\u7406\u306e\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\u6559\u6750\" width=\"1140\" height=\"855\" src=\"https:\/\/www.youtube.com\/embed\/QXBs2HdO8r0?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>In this animation, many wave sources are shown at once. However, in most textbooks, Huygens diagrams focus on just one representative wavelet to derive the law of refraction, also known as Snell\u2019s Law.<\/p>\n<p>If you\u2019d like to experiment with multiple wave sources yourself, you can also try this <a href=\"https:\/\/scratch.mit.edu\/projects\/216301701\/\">Scratch simulation<\/a>.<\/p>\n<h3>One Principle That Connects Everything<\/h3>\n<p>Diffraction, reflection, and refraction may seem like completely different phenomena at first glance. But Huygens showed that all of them can be understood through one single principle.<\/p>\n<p>More than 350 years later, his idea is still a powerful tool in modern physics.<\/p>\n<p>The next time you notice light bending, try imagining how waves are overlapping beneath the surface. The everyday world may start to look a little more mysterious\u2014and a lot more fascinating.<\/p>\n<div class=\"g-ytsubscribe\" data-channelid=\"UCBoF1yPvFnXnSJ_Xe5AmXcw\" data-layout=\"full\" data-count=\"default\"><\/div>\n<h3>Contact &#038; Requests<\/h3>\n<p>Science should feel exciting and accessible! On this site, you\u2019ll find fun science experiments you can try at home, along with easy-to-follow explanations and tips. Feel free to explore!<\/p>\n<p>\u30fbThe contents of \u201cScience Notebook\u201d have been published as a book. Learn more <a href=\"https:\/\/amzn.to\/42PMCEL\">here<\/a><br \/>\n\u30fbAbout the creator, Ken Kuwako, click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=37\">here<\/a><br \/>\n\u30fbFor requests such as writing, lectures, science workshops, TV supervision, or appearances, click <a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">here<\/a><br \/>\n<span class=\"s2\">\u30fbFollow updates for new articles on <a href=\"https:\/\/x.com\/kuwako\">X<\/a>!<\/span><\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/www.youtube.com\/user\/kkuwako\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-35048\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/03\/3d9640dad7bc5538e76f92da1966ee19.jpg\" alt=\"\" width=\"30\" height=\"21\" \/><\/a><a href=\"https:\/\/www.youtube.com\/user\/kkuwako?sub_confirmation=1\">Science Idea Channel<\/a> features hands-on experiment videos!<\/p>\n<h3>\uff15\u6708\u306e\u30a4\u30c1\u30aa\u30b7\u5b9f\u9a13\uff01<\/h3>\r\n<p>\u30ad\u30fc\u30f3\u3068\u51b7\u3048\u308b\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\uff01\u6c17\u6e29\u304c\u4e0a\u304c\u3063\u3066\u304f\u308b\u3053\u306e\u6642\u671f\u30fb\u30c9\u30e9\u30a4\u30a2\u30a4\u30b9\u3092\u4f7f\u3063\u305f\u6607\u83ef\u30fb\u51dd\u7d50\u30fb\u7b49\u901f\u5ea6\u76f4\u7dda\u904b\u52d5\u306e\u5b9f\u9a13\u306f\u3044\u304b\u304c\uff1f<\/p>\r\n<p><img class=\"alignnone wp-image-39516 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe.jpg\" sizes=\"auto, (max-width: 550px) 100vw, 550px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe.jpg 1406w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-300x168.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2022\/03\/0618612becc032a60bdda50090ccccbe-1024x572.jpg 1024w, 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href=\"https:\/\/phys-edu.net\/wp\/?p=62906\">\u79d1\u5b66\u76e3\u4fee\u3092\u62c5\u5f53\u3057\u307e\u3057\u305f<\/a>\u3002<\/li>\r\n<li>5\u67088\u65e5\uff08\u91d1\uff09<a href=\"https:\/\/phys-edu.net\/wp\/?p=62629\">\u7406\u79d1\u6559\u80b2\u30cb\u30e5\u30fc\u30b9<\/a>\u3092\u62c5\u5f53\u3057\u307e\u3057\u305f\u3002<\/li>\r\n<li>6\u670814\u65e5\uff08\u65e5\uff09\u3000\u5343\u8449\u5927\u5b66\u30a4\u30f3\u30b9\u30bf\u30ec\u30fc\u30b7\u30e7\u30f3\u300c\u63a2\u7a76\u300d\u306b\u3066\u8b1b\u5e2b\u3092\u52d9\u3081\u307e\u3059<\/li>\r\n<li>6\u670826\u65e5\uff08\u91d1\uff09\u3000\u5343\u8449\u5927\u5b66\u306e\u516c\u958b\u7814\u7a76\u4f1a\uff08\u4e2d\u5b66\u7406\u79d1\u306b\u3064\u3044\u3066\u6388\u696d\u516c\u958b\u4e88\u5b9a\uff09<\/li>\r\n<li>7\u670818\u65e5\uff08\u571f\uff09\u3000<a href=\"https:\/\/phys-edu.net\/wp\/?p=60018\">\u6559\u54e1\u5411\u3051\u5b9f\u9a13\u8b1b\u7fd2\u4f1a\u300c\u30ca\u30ea\u30ab\u30ab\u30b5\u30a4\u30a8\u30f3\u30b9\u30a2\u30ab\u30c7\u30df\u30fc\u300d\u306e\u8b1b\u5e2b\u3092\u3057\u307e\u3059<\/a>\u3002\u304a\u4f1a\u3044\u3057\u307e\u3057\u3087\u3046\u3002<\/li>\r\n<\/ul>\r\n<h3><b>\u66f8\u7c4d<strong>\u306e\u304a\u77e5\u3089\u305b<\/strong><\/b><\/h3>\r\n<ul>\r\n<li>\u300e\u5927\u4eba\u306e\u305f\u3081\u306e\u9ad8\u6821\u7269\u7406\u5fa9\u7fd2\u5e33\u300f\uff08\u8b1b\u8ac7\u793e\uff09\u2026\u4e00\u822c\u5411\u3051\u306b\u65e5\u5e38\u306e\u7269\u7406\u306b\u3064\u3044\u3066\u516c\u5f0f\u3092\u5143\u306b\u7d10\u89e3\u304d\u307e\u3057\u305f\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=1827\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u3067\u306f\u5b9f\u9a13\u3092\u591a\u6570\u7d39\u4ecb\u3057\u3066\u3044\u307e\u3059\u3002<strong>\u203b\u5897\u5237\u304c\u304b\u304b\u308a\uff16\u5237\u3068\u306a\u308a\u307e\u3057\u305f\uff082026\/02\/01\uff09<br \/><img class=\"alignnone wp-image-10940 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg\" sizes=\"(max-width: 220px) 100vw, 220px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0-300x262.jpg 300w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2013\/12\/0811159a99f69eeff1a357e3daed84e0.jpg 311w\" alt=\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8 2014-07-05 0.43.51\" width=\"220\" height=\"192\" \/><br \/><\/strong><\/li>\r\n<li>\u300e\u304d\u3081\u308b!\u5171\u901a\u30c6\u30b9\u30c8 \u7269\u7406\u57fa\u790e \u6539\u8a02\u7248\u300f\uff08\u5b66\u7814\uff09\u2026\u3000\u9ad8\u6821\u7269\u7406\u306e\u53c2\u8003\u66f8\u3067\u3059\u3002\u30a4\u30e9\u30b9\u30c8\u3092\u591a\u304f\u3057\u3066\u30a4\u30e1\u30fc\u30b8\u304c\u6301\u3066\u308b\u3088\u3046\u306b\u63cf\u304d\u307e\u3057\u305f\u3002\u6388\u696d\u306b\u3064\u3044\u3066\u3044\u3051\u306a\u3044\u3001\u7269\u7406\u304c\u82e6\u624b\u3001\u305d\u3093\u306a\u751f\u5f92\u306b\u304a\u3059\u3059\u3081\u3067\u3059\u3002<a href=\"https:\/\/phys-edu.net\/wp\/?p=45322\">\u7279\u8a2d\u30b5\u30a4\u30c8<\/a>\u306f\u3053\u3061\u3089\u3002<br \/><img class=\"alignnone wp-image-45718 aligncenter\" src=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg\" sizes=\"(max-width: 184px) 100vw, 184px\" srcset=\"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c.jpg 756w, https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2024\/04\/dc1da64a8c8d1422062b4867c0607a1c-300x269.jpg 300w\" alt=\"\" width=\"184\" height=\"165\" \/><\/li>\r\n<\/ul>\r\n<h3><span style=\"text-align: center;\">\u5404\u7a2eSNS\uff08\u66f4\u65b0\u60c5\u5831\u3092\u304a\u5c4a\u3051\uff01\uff09<\/span><\/h3>\r\n<p style=\"text-align: center;\"><a style=\"text-align: center;\" href=\"https:\/\/twitter.com\/kuwako\">X(Twitter)<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.instagram.com\/science_seeds\/\">instagram<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.facebook.com\/kuwakolab\/\">Facebook<\/a>\uff08\u65e5\u672c\u8a9e\uff09<\/p>\r\n<p style=\"text-align: center;\"><a style=\"text-align: center;\" href=\"https:\/\/bsky.app\/profile\/kagakunoneta.bsky.social\">BlueSky<\/a><span style=\"text-align: center;\">\uff0f<\/span><a style=\"text-align: center;\" href=\"https:\/\/www.threads.net\/@science_seeds?hl=ja\">Threads<\/a>\uff08\u82f1\u8a9e\uff09<\/p>\r\n<h3 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href=\"http:\/\/phys-edu.net\/wp\/?page_id=37\">About<\/a>\u00a0\u2026\u300c\u79d1\u5b66\u306e\u30cd\u30bf\u5e33\u300d\u306e\u30b3\u30f3\u30bb\u30d7\u30c8\u3084\u3001\u904b\u55b6\u8005\u3067\u3042\u308b\u6851\u5b50\u7814\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\u30fb\u60f3\u3044\u3092\u307e\u3068\u3081\u3066\u3044\u307e\u3059\u3002<\/li>\r\n<li><a href=\"https:\/\/phys-edu.net\/wp\/?page_id=188\">\u304a\u554f\u3044\u5408\u308f\u305b<\/a> \u2026\u5b9f\u9a13\u6559\u5ba4\u306e\u3054\u4f9d\u983c\u3001\u57f7\u7b46\u30fb\u8b1b\u6f14\u306e\u76f8\u8ac7\u3001\u79d1\u5b66\u76e3\u4fee\u7b49\u306f\u3053\u3061\u3089\u306e\u30d5\u30a9\u30fc\u30e0\u304b\u3089\u304a\u5bc4\u305b\u304f\u3060\u3055\u3044\u3002<\/li>\r\n<\/ul>\r\n","protected":false},"excerpt":{"rendered":"<p>I\u2019m Ken Kuwako from Science Trainer. Every day is an experiment. Have you ever heard that light can bend? The  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":63345,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_sitemap_exclude":false,"_sitemap_priority":"","_sitemap_frequency":"","sns_share_botton_hide":"","vkExUnit_sns_title":"","vkexunit_cta_each_option":"","_lightning_design_setting":{"layout":"default"},"footnotes":""},"categories":[781],"tags":[],"class_list":["post-63349","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science-en"],"jetpack_featured_media_url":"https:\/\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2026-05-13-4.07.26.jpeg","jetpack-related-posts":[{"id":60672,"url":"https:\/\/phys-edu.net\/wp\/?p=60672&lang=en","url_meta":{"origin":63349,"position":0},"title":"Why Do Waves Bend? Master the Tough Huygens\u2019 Principle with a Magical Simulation (Scratch)","author":"\u6851\u5b50 \u7814","date":"2026\u5e742\u670818\u65e5","format":false,"excerpt":"Hi, I'm Ken Kuwako, your Science Trainer. To me, e\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2018\/04\/2d604cb7864fb470182569960ec46570.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2018\/04\/2d604cb7864fb470182569960ec46570.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2018\/04\/2d604cb7864fb470182569960ec46570.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2018\/04\/2d604cb7864fb470182569960ec46570.png?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":63258,"url":"https:\/\/phys-edu.net\/wp\/?p=63258&lang=en","url_meta":{"origin":63349,"position":1},"title":"See Light Bend Through the Sports Day Whirlwind! The Amazing Mystery of Total Internal Reflection (Huygens\u2019 Principle","author":"\u6851\u5b50 \u7814","date":"2026\u5e745\u670810\u65e5","format":false,"excerpt":"This is Kuwako Lab, your science trainer. Every da\u2026","rel":"","context":"Science","block_context":{"text":"Science","link":"https:\/\/phys-edu.net\/wp\/?cat=781&lang=en"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/584cbdc9b7f6924085f7e2737511121c.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/584cbdc9b7f6924085f7e2737511121c.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/584cbdc9b7f6924085f7e2737511121c.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/phys-edu.net\/wp\/wp-content\/uploads\/2020\/04\/584cbdc9b7f6924085f7e2737511121c.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":54624,"url":"https:\/\/phys-edu.net\/wp\/?p=54624&lang=en","url_meta":{"origin":63349,"position":2},"title":"Recreate a 200-Year-Old Scientific Breakthrough with Paper Cups! See Proof That Light Is a Wave at Home (Young\u2019s Experiment)","author":"\u6851\u5b50 \u7814","date":"2025\u5e7410\u670819\u65e5","format":false,"excerpt":"This is Kuwako Lab, your science trainer. 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