Which term refers to the following definition: Possessing different physical or optical properties in different crystal directions?

Which term refers to the following definition: Possessing different physical or optical properties in different crystal directions?

• A. Drift
• B. Doubly refractive (anisotropic)
• C. Emplacement
• D. Dispersion

Answer: (B)

Crystals can exhibit properties that depend on direction, a condition known as anisotropy. When a crystal is anisotropic, its refractive index varies with the direction light travels through it. This means light can travel at different speeds along different crystal axes, and if the light has polarization components, it can split into two rays with different speeds and polarizations—double refraction. This phenomenon is exactly what "doubly refractive (anisotropic)" describes. The other terms refer to different ideas. Drift is unrelated to optical directionality, dispersion concerns how refractive index changes with wavelength rather than direction, and emplacement is not about optical properties. So the term that best matches the definition is the doubly refractive (anisotropic) description.

Crystals can exhibit properties that depend on direction, a condition known as anisotropy. When a crystal is anisotropic, its refractive index varies with the direction light travels through it. This means light can travel at different speeds along different crystal axes, and if the light has polarization components, it can split into two rays with different speeds and polarizations—double refraction. This phenomenon is exactly what "doubly refractive (anisotropic)" describes.

The other terms refer to different ideas. Drift is unrelated to optical directionality, dispersion concerns how refractive index changes with wavelength rather than direction, and emplacement is not about optical properties. So the term that best matches the definition is the doubly refractive (anisotropic) description.