Which term refers to the following definition: The property of differing crystal directions being optically or physically distinct?

Which term refers to the following definition: The property of differing crystal directions being optically or physically distinct?

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

Answer: (B)

Crystals can behave differently depending on the direction light travels through them. This direction-dependent behavior is called anisotropy, and when it affects light, the crystal is optically anisotropic. In such crystals, light can travel at different speeds along different axes, causing it to split into two rays with different refractive indices—this is double refraction, or birefringence. The term that best captures this property is doubly refractive (anisotropic) because it explicitly describes both the splitting of light and the directional dependence. The other options don’t fit because they aren’t about directional optical properties: an electronic retailer has no relation to crystal optics; dispersion describes how different wavelengths refract differently, which can occur but isn’t about direction-dependent behavior inside a crystal; drift refers to the motion of charge carriers under an electric field.

Crystals can behave differently depending on the direction light travels through them. This direction-dependent behavior is called anisotropy, and when it affects light, the crystal is optically anisotropic. In such crystals, light can travel at different speeds along different axes, causing it to split into two rays with different refractive indices—this is double refraction, or birefringence. The term that best captures this property is doubly refractive (anisotropic) because it explicitly describes both the splitting of light and the directional dependence.

The other options don’t fit because they aren’t about directional optical properties: an electronic retailer has no relation to crystal optics; dispersion describes how different wavelengths refract differently, which can occur but isn’t about direction-dependent behavior inside a crystal; drift refers to the motion of charge carriers under an electric field.