{"product_id":"snells-window-plate-025-physics-poster","title":"Snell's Window – Plate 025 Physics Poster","description":"\u003cp\u003ePlate 25 speaks for itself: \u003cem\u003e“The whole sky, through a 97° hole.”\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eLooking up from under water, the whole hemisphere of sky is squeezed into a circle bounded by the critical angle. Outside it you see total internal reflection of the water below.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eθ_c = arcsin(1\/n)\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eθ_c: critical angle, °\u003c\/li\u003e\n\u003cli\u003en: refractive index of water, dimensionless\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003en = 1.333: θ_c ≈ 48.6°, window 97.2°.\u003c\/p\u003e\u003ch3\u003eSources\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eE. Hecht, Optics, 5th ed., §4.7.\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eOn the poster\u003c\/h3\u003e\u003cp\u003ePlate 025, “Snell's Window”: the pixel-art plate with its slogan “The whole sky, through a 97° hole.”, the key equation and the facts panel shown above. Pixelated Physics. Physics. Personified.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"9'' x 12\" (Vertical) \/ Matte","offer_id":50961843617895,"sku":"29158663058564748570","price":19.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Fine Art","offer_id":50961843650663,"sku":"29159604575428151892","price":29.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Semi Glossy","offer_id":50961843683431,"sku":"12184966687882976327","price":19.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Fine Art","offer_id":50961843716199,"sku":"24180887863526623801","price":44.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Semi Glossy","offer_id":50961843748967,"sku":"36336282247645692434","price":29.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Matte","offer_id":50961843781735,"sku":"25323116551669785249","price":29.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Matte","offer_id":50961843814503,"sku":"21702218052201521501","price":69.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Fine Art","offer_id":50961843847271,"sku":"51801665292026399116","price":119.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Semi Glossy","offer_id":50961843880039,"sku":"56159465956294149980","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/10353769326320634034_2048.jpg?v=1793633405","url":"https:\/\/pixelatedphysics.com\/es\/products\/snells-window-plate-025-physics-poster","provider":"Pixelated Physics","version":"1.0","type":"link"}