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.addSize([768, 0], [[728, 90]]) // Smaller (laptop) screen ads .addSize([0, 0], [[300, 250], [320, 50]]) // Mobile screen ads .build(); // Homepage & listing ads const t_1 = defineIfSlot('/21821800277/pw/pw_t_hp', [[970,90],[728,90],[729,90],[300,250],[320,50]], 'div-gpt-ad-3759129-18', pubads); const t_2 = defineIfSlot('/21821800277/pw/pw_t1_hp', [[970,90],[728,90],[729,90],[300,250],[320,50]], 'div-gpt-ad-3759129-19', pubads); const t_3 = defineIfSlot('/21821800277/pw/pw_t2_hp', [[970,90],[728,90],[729,90],[300,250],[320,50]], 'div-gpt-ad-3759129-20', pubads); // Only map if they actually exist t_1 && t_1.defineSizeMapping(leaderboard); t_2 && t_2.defineSizeMapping(leaderboard); t_3 && t_3.defineSizeMapping(leaderboard); // Search results const headerSize = googletag.sizeMapping() .addSize([970, 0], [[970, 90]]) .addSize([0, 0], [[320, 50]]) .build() // Header ad (always appears) googletag.defineSlot('/21821800277/pw/pw_h_sw', [[970,90], [320, 50]], 'div-gpt-ad-5400963-20').defineSizeMapping(headerSize).addService(pubads); // Only apply targeting if values exist const article_og = getOgType(); if ( article_og ) { pubads.setTargeting( "articleTag", article_og ); } const article_type = getMetaContent( "oas:article-type" ); if ( article_type ) { pubads.setTargeting( "articleType", article_type ); } const article_category = getMetaContent( "oas:category" ); if ( article_category ) { pubads.setTargeting( "category", article_category ); } const article_sub = getMetaContent( "oas:sub-category" ); if ( article_sub ) { pubads.setTargeting( "subCategory", article_sub ); } // Add class to body if ads are visible pubads.addEventListener( "impressionViewable", function () { document.body.classList.add("has-ads"); }); pubads.enableSingleRequest(); pubads.collapseEmptyDivs(); // Start! googletag.enableServices(); }); </script>  </head> <body class="archive category category-imaging category-159 category-instrumentation-measurement 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sizes="(max-width: 135px) 100vw, 135px" /> <span class="sr-only">Read article: How do electromagnetic waves carry information about objects they interact with?</span> </a> <div class="listing-block__info"> <ul class="hero-top-banner__category"> <li><a href="https://physicsworld.com/c/instrumentation-measurement/imaging/" style="color: #ca991b;">Imaging</a></li> <li><a href="https://physicsworld.com/l/research-updates/" style="color: #ca991b;">Research update</a></li> </ul> <h3 class="listing-block__title"> <a href="https://physicsworld.com/a/how-do-electromagnetic-waves-carry-information-about-objects-they-interact-with/" title="How do electromagnetic waves carry information about objects they interact with?"> <b>How do electromagnetic waves carry information about objects they interact with?</b> </a> </h3> <p>Theorists develop new continuity equation to help them visualize the process</p> </div> </article> <div class="wrapper clearfix"> <div class="ajax__container 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