birefringence

/ˌbaɪrɪˈfrɪndʒəns/
noun
  1. The property of a material that splits a single light ray into two different rays, each traveling at a different speed, often seen in crystals like calcite.
    • Calcite is famous for its strong birefringence, which makes objects viewed through it appear double.
    • The birefringence of certain plastics can create colorful patterns when viewed under polarized light.
    • Scientists use birefringence to study the internal structure of minerals and polymers.
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