Which term describes the property of a gem that does not split light into two rays due to direction independence?

Which term describes the property of a gem that does not split light into two rays due to direction independence?

• A. Isotropic
• B. Polycrystalline
• C. Birefringent
• D. Anisotropic

Answer: (C)

Isotropic means the optical properties are the same in all directions, so a light ray travels through the material as a single ray without splitting into two. This direction-independent behavior is what prevents double refraction. Birefringent describes a material that splits light into two rays because its refractive index varies with direction or polarization. Anisotropic refers to direction-dependent properties in general, which often lead to birefringence. Polycrystalline describes the crystal structure, which can sometimes average out to isotropic behavior but does not by itself define the lack of splitting. The gem described—not splitting light due to direction independence—fits the term isotropic.

Isotropic means the optical properties are the same in all directions, so a light ray travels through the material as a single ray without splitting into two. This direction-independent behavior is what prevents double refraction. Birefringent describes a material that splits light into two rays because its refractive index varies with direction or polarization. Anisotropic refers to direction-dependent properties in general, which often lead to birefringence. Polycrystalline describes the crystal structure, which can sometimes average out to isotropic behavior but does not by itself define the lack of splitting. The gem described—not splitting light due to direction independence—fits the term isotropic.