Iceland Spar: The Rock That Discovered Optics
Iceland Spar: The Rock That Discovered Optics
Dec 12, 2013
petapixel.com
WhyThoFacts | Daily Curiosity on Instagram: "Iceland spar is a clear calcite crystal that splits incoming light into two rays. Place lines, text or an object underneath, and it appears doubled, a property called birefringence. Vikings may have used it to navigate by polarized sunlight. A compass made of crystal. Follow for more little wonders of the world 🌍 #WhyThoFacts #IcelandSpar #Optics #Geology #Polarization"
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