Uploaded April 2017 | Updated September 2026, 3 weeks ago
If you look at the words on the printed page through this crystal, you see double. These natural, nearly transparent crystals exhibit the property of 'birefringence', i.e., they can break light into two distinct polarized beams. By rotating a polarizing filter over the crystal, it is possible to view one image at a time!
If you look at the words on the printed page through this crystal, you see double. These natural, nearly transparent crystals exhibit the property of 'birefringence', i.e., they can break light into two distinct polarized beams. By rotating a polarizing filter over the crystal, it is possible to view one image at a time!
