(Antisotropic) possessing different physical or optical properties in different crystal directions?

(Antisotropic) possessing different physical or optical properties in different crystal directions?

• A. Doubling
• B. Doubly Refractive
• C. Crystal Planes
• D. Crystal Systems

Answer: (B)

Directional dependence of properties in crystals leads to birefringence: a crystal that is anisotropic has different refractive indices depending on the direction of light travel. When light enters such a crystal, it splits into two rays that travel at different speeds and are polarized differently—this is called double refraction or doubly refractive. Because the statement describes possessing different physical or optical properties in different crystal directions, the best-fit term is doubly refractive. The other concepts don’t capture this directional optical variation: doubling isn’t a technical term in optics; crystal planes relate to the geometry used in diffraction, not to directional variation in properties; crystal systems describe lattice symmetry, not the directional optical response.

Directional dependence of properties in crystals leads to birefringence: a crystal that is anisotropic has different refractive indices depending on the direction of light travel. When light enters such a crystal, it splits into two rays that travel at different speeds and are polarized differently—this is called double refraction or doubly refractive. Because the statement describes possessing different physical or optical properties in different crystal directions, the best-fit term is doubly refractive. The other concepts don’t capture this directional optical variation: doubling isn’t a technical term in optics; crystal planes relate to the geometry used in diffraction, not to directional variation in properties; crystal systems describe lattice symmetry, not the directional optical response.