What is bi-fringes?

Answer 1

Bi-fringes, or birefringence fringes, are optical patterns observed in materials that exhibit birefringence, a property where a material has two different refractive indices depending on the polarization and propagation direction of light. When polarized light passes through a birefringent material, it splits into two rays, each traveling at a different velocity, leading to interference patterns known as bi-fringes. These patterns can be used in various applications, including optical microscopy and material characterization, to analyze the properties of the material.